The guy has been training for at least a decade there
He's 25 in that video...
i'm 25 now and i've been training since 14
I've been training since I was 15 too. The point is, "he must've trained at least for 10 years" is bullshit. You could train from 19 to 25 and look like that, easily. You're not going to make huge gains from 15 to 17 unless you're Lee Priest (that's not Lee Priest)
Just like Brian Dobson supported Ronnie Coleman with a free membership and Weider supported Arnold and many. Bader Boodai did the same.