It's really hard to say what he's on in this pic, he sure doesn't look like he's on high doses of AAS though. Looks like an IG fitness model if anything. To me key factor is lifestyle, the lifestyle of a Hollywood star is a lot different than a disciplined bodybuilder. Not that being an actor doesn't take discipline, but the lifestyle is a lot different requiring the need of potential aids to get the job done. From day to day, you're on set for 12 -12+ hours, you may get requested meals cooked for you, but you're not eating every hour and a half or 2 hours through the day. They're lucky to get a quick workout in first thing or at the end of the day. Sly is known for moving through takes, this is coming directly from himself, he hates taking multiple takes, he likes getting a scene on first take and moving on. Hollywood is known for lots of rec drugs being around to get filming done, plus, throw in a level of being constantly dehydrated. Who knows, but he sure doesn't look like someone who is abusing AAS.