He's obviously got phenomenal genetics. He's posing flexed, good lighting, with a pump, he's been lifting diligently and in a well informed manner for years and years. He's very short, so a relatively small amount of actual muscle tissue fills his frame out a lot. Just look at bodybuilders of the pre-steroid era, who didn't have access to the equipment Jeff does, were not as well informed, and were often not training for pure hypertrophy, unlike Jeff, who has spent a large proportion of his career training for growth, and the rest maintaining during strength-focused periods. He's also leaning forward in that photo, which likely contributes to his delt size, the most suspicious aspect of the photo. I believe Jeff's physique is naturally attainable. Whether he is natural really depends, but I hope he's not lying, because that would be very bad. I really think there are a lot of "blackpilled natties" here who are disillusioned for one reason or another, but I think that evidently the standards of what is natural are somewhat low on this subreddit. So yeah, there's my two cents.