His arms truly are something, from a size perspective. However, the judging standards are piss poor to reward such an unbalanced and narrow physique.
I know it's not his fault he's so narrow, but neither is it his "fault" his arms are so big.
Drugs built his body and the only platform upon which he is a champion is in how favourably he responds to mountains of anabolic drugs.
There's a guy at my gym with insane upper-arm size. No lie, mirroring Heath's drug usage, this cat's arms would likely dwarf Phil's. They're that big. But the rest of him is far, far lesser in impressiveness. Guy takes a little here and there and grows guns taping well over 20 inches.