His bench press isn't too good, not even considering his weight. His squat is ok and his deadlift is great. He might be great at his strongman stuff though.
I really don't think the numbers I wrote are that crazy. It should be attainable for anyone who his dedicated and serious enough. I think you should even try to get stronger than that. Let me explain.
Plenty of bros on a lot of juice who don't even know how to train beside the bench press rep out with 365-385. I am talking about the worst degenerate monkeys there is out there. I am not even sure they do train anything else but the bench press.
Just 1 or 2 weeks ago a 300-350lbs, 6'7 and 20 years old big and soft guy I go to gym with benched 455lbs for 1 rep. I have seen this guy squatting, he can't even squat 275 for reps.
Some 25-30 years old iron hobbit at my gym is a squat specialist and can do 5-6 reps with 510lbs.
Plenty of skinny guys with long levers can deadlift alot.
So to consider yourself good you have to be at least as good as these weirdos in their best lifts,for every lift. Thus 400/500/650 for reps. Right now I lift let's say 50 pound less than these numbers for 1 rep. I have very normal genetics, I wasn't athetic when I was a teen. It's realist to think I can add 50 pounds on each of my lifts and do a few rep with it over the next years.
About the vegan thing, I would really consider it if I really thought it would be as good for training. I even tried it for a while when I was younger. It's convenient to eat less meat, it's more ethical, etc. I just really doubt it would be as good for training and that's my main concern.