He's 6-5 and weighs 182 lbs. He weighed 181 last year. Yes, he gained exactly one pound.
https://floridastate.rivals.com/news/spring-roster-weights
182 is a good weight for a guy that's like 6 feet. At 6-5. he should be in the Ramones.
I don't buy that it's a lack of effort. He obviously works out if he's playing D1 college football. There's no way that you can get out of that. And it doesn't take any effort to eat more. If he was just getting fat and sloppy, I would agree with the "lack of effort" hypothesis, but he's staying super skinny.
I think he must have some kind of metabolic issue where he legitimately can't put on weight. That's just my own speculation, but it seems like the simplest explanation. If he wasn't an athlete, I would assume that he was addicted to amphetamines, but since he gets tested on the reg, that can't be it either.