I didn't know anything about him either, saw same vid somewhere and did some googling. The vid mentions that it wasn't just aas, but also other things ppl here might take, oxy-pro elite, otc fat burners, pre-workouts, etc.
BUT, he was also heavy into drugs called Fantasy and GBL. I am not into the scene enough to recognize those names, don't know if they resonate here in the States or if that is more New Zealand slang, but they are more in the "party drug" family, and neither aas nor GH. His main legal problems were from the sale of Fantasy, which he also used. There is no telling what all caused his pathetic state in the vid, but it looks like NZ media over-focuses on aas in much the same way US media does.