Ed, I don't see obvious SEO in his arms. I mean sure they are big, but is there anything other than their size that makes them suspect in your eyes?
Eventually, you'll get an eye for SEO. Usually it's not Valentino-esque but more like Derek Anthony-esque or BLP-esque. The bicep seems to have a permanent contraction in place -- slightly lumpy and swollen in a way that non-SEO arms don't have.
Sadly, it's become rather commonplace lately even at lower level shows.
Biceps are a hardgainer bodypart -- if you're not gifted in that area, you're fucked. You can do concentration curls, 21s and hammers til the cows come home but if the muscle fibers aren't there, SEO is your only option to progress at the higher levels.
Think about it: MILOS THE MIND did it more than ten years ago. Granted he did a shitty job, but that gives you an idea of how long it's been going on.
Soon enough bodybuilders will spend more time on site injecting than they will actually training.