See those traps? Steroids. The traps are the tell. Not the rest of his physique in his case; just the traps.
Steroids or not, his performance numbers are still amazing. And even if he is taking something, it's not like the rest of field is clean.
I can't comment on anyone else and I don't know the comparative results. If he chooses to juice, that's entirely up to him. But it's not a fair win if others were not doing the same. It's like a good student who studied but decided to get an additional edge by cheating a little. And then he got amazing grades. Maybe he would still have had the best grade without cheating, if perhaps not quite as high a grade. But we'll never know, will we?