TDEE bullshit

yes, except the going to the gym for 3 hours part. there's no need to exaggerate to show that you disagree with what i said.
if you are doing PPL (as you should, because it's unironically the best routine), then spending 1 hour and 15-30 minutes in the gym is enough to get up to 25-30 working sets a week for each body part, which is what gets you growth, as long as you are eating properly. that's if you do PPLPPLx.
on the rest day, you can go no carbs at all, to somewhat balance out all the carbs you've eaten on training days.

Ok so both that calculator and the one in the sticky are bullshit then, how do you know it's 500 over what it says?

i'd understand this if you were referring to being on a deficit, but for being on a surplus? are you fucking serious? just fucking EAT. get a general idea of how many calories, protein, carbs and fats are present in each of your most eaten foods, and work with that. it's like 5 minutes of googling. there's no need to be autistic about and use shit like myfitnesspal if you are just a recreational lifter. you do realize that it is virtually impossible for you to hit, for example, EXACTLY 3300 kcal every single fucking day, right? there are too many variables.
this shit should be taught in pre and highschool.

But ultimately that means TDEE is complete nonsense because @ my TDEE of 3k, if I follow your carb routine I would theoretically be eating about 22 calories a day if I converted it and that seems god-awfully low to the point where I usually cut at that. How can I know this actually works.

You have to work backwards. You should know how many calories you are eating, and what is happening to your weight over the past month or so. Given that data, you can calculate your TDEE.

i'm not discrediting TDEE because i don't have the credentials nor the knowledge to do that, but what i can say, is that TDEE is not something a recreational lifter should rely on, as the variables are way too many. did you have to run to catch your buss today? ooops, you burned more calories. did you get enough sleep? were you stressed at work? that's more burned calories. you see what i'm getting at?
what's your current bodyweight

Yeah I see what you mean, I'm sitting at 180lbs right now

try to get roughly 200g of protein and 250g of carbs in every day + trace fats, meaning you don't count that shit. if you eat things such as salmon, red meat, avocado, shit cooked with olive oil, you should be getting enough fats. eat as many veggies as you can. not broccoli and cauliflower, that shit gets you bloated. cucumber, kale, spinach, shit like that.
at this point you know what food you have access to throughout your day. learn what it's macros are and adjust accordingly. also, if you can, space out your meals. it is more forgiving on your digestion more than anything.

I run about 40km a week at a 5min/km pace and do boxing at a very high intensity 4 hours a week plus some hours of skipping rope and body weight exercise.
I seem to hold my weight at 2500-3000 calories, being a 78kg male at 1.80m

also, needless to say, drink water. 3 litres a day AT LEAST.
and look into my post above about doing PPL. yes, you are a lifting as a hobby, but if you want results, you gotta train and put the time in. there's no two ways about it. "less is more" doesn't really apply in this scenario. people hate to hear that their "full body 3 times a week routine, i'm in and out of the gym in 1 hour bro" may not be the optimal path to their desired goals.

Ok this seems more doable. Only thing is I'd have to drink 2 bottles of whey protein supplements to get 200g of protein including meals. Not a fan of liquid carbs but if that works then why not.

yea, that's the shitty part. technically, you don't need supplements, but in practicality, you really end up not having the time to get the meals in, and i won't argue with that. so you gotta get protein shakes.
myprotein products are fine and at a very reasonable price, considering they have some kinda discount all the time. not sure if they deliver to the US of A tho

money isnt an issue, im in Canada so its probably even more pricey here but im more than happy buying the powder if it delivers. How do I calculate how many carbs I need similar to how you did, like say I get to 190 now, do I need 220g of protein and now 300 carbs?

don't have a formula for that, i just threw a number at you so you can have something to go off and not make it confusing. just keep the carbs higher than the protein by say 60-70, if not even more. something like that.
on your rest day/s though, if you can, eat no/low carbs, but keep protein the same. you don't need carbs on your rest days, since you are not exercising and don't need the extra energy. but then, if after a rest day you are training in the morning, then you may want to get some carbs in the night before.
also, in regards to the training itself, let me put it like this - if you want maximum hypretrophy, you need to get at least 20 working sets per body part, per week. to keep it simple, a working set is a set for at least 8 reps, using your 80-85% rep max. there's calculators for that online.
with the above being said, you are not REQUIRED to do PPL, but this routine just so happens to mix and match everything nicely, allowing for good recovery, tolerable time spent in the gym, and getting the needed the volume in.

I cut on 1700 a day and that ends up being around 0.8 lbs lost a week.
I'm not too different from your stats.