I'm a newb to see these differences between natty and geared, what makes him look geared? Because he isn't all veiny and shit, from what I associate with being on gear.
You don't always get veiny from gear. Veiny is a result of arteries expanding which may come as a result of bigger muscles needing blood. Some bodybuilders take poppers before training for this very reason.
I have small veins, I'm never veiny and my body tends to develop thicker but smaller muscles. I guess if I took gear I would be kinda fucked.
And that takes me to Jeff Nippard, dude's 5'5 (164 for euros). He's, like, really short. Short sizes make very solid, compact muscles, very beautiful muscles, but they also come with a limit about how much muscle you can build. Dude's got the muscles of somebody taller with that height.
I really like his body, but he's carrying what I think is more weight than a guy his height can support naturally.
Besides, your muscles look different when not on gear. You will always be having a swimmer-like figure. With more or less volume a natural lifter will always have compact, lean, linear shapes.
Gear will give you the rounded, puffier, expansive muscles. And it will be most noticeable in those body parts that have more androgenic receptors, that is the lats and the shoulders, incidentally the hardest parts to develop naturally.
Guys with gear will have huge both.
In summary: lean, swimmer-like muscles with a compact, toned volume you cannot prove he's not on gear, he might be or he might be not.
Round, puffy, expansive muscles like out of a gay porn, especially lats and shoulders are tell tale signs of roids.
Also, if he has abs all year round but he keeps increasing muscle mass, something's fishy. I'm not talking toned abs. I'm talking chiseled, carved abs.
Edit: I feel like I registered on the Kiwifarms to shit on people, I might join some yoga group or something