Nope. He'll stay fat, disappear from the boards for a while, and then pop up again spamming left right and center, saying that the 'contest' was a joke, and everybody is taking Getbig far too seriously.
I predict that once contest time appears, Nasser will pull the plug on Alex's prep, as he said in the video he is going to either give Alex the green light to compete or pull him out of the show if hes going to embarrass himself, its like the excuse is already preset into the whole deal. (Either that or Nasser is helping Alex cause he wants him to get in shape, but he knows he'll get raped in a real competition against coach, letting the motivation of beating Coach drive Alex into shape so he can really SEE what he looks like, so hopefully he drops that "Im so awesome god given genetics I look at weights and I weigh 250lbs" attitude.)
Anyway, off my ramble, Nasser is going to pull Alex once his gets close, due to either 1st time inexperience, stomach flu, some sort of injury, or something. and Alex will go on the whole I would have kicked your ass if I had been able to put everything into it, check out how I great I am at 60%, etc etc etc.