I hate to defend Tom Brady and he may be doing some kind of designer EPO or HGH, but he's also maybe the most diligent QB in the NFL with respect to maintaining his body.
He was the first to go to Tom House at USC, iirc, and he's an absolute fiend in doing QB specific exercises...
NO amount of HGH or any PED throws the ball with the kind of touch he still possesses.
The cheating was always having an unfair advantage based on knowledge of the other team as well as the NFL steering games via refs for them.
Don't get me wrong, I'm NOT a Brady fan... but he's doing it at a very high level... except last week... watching that shut out was a JOY!!!