Board Thread:General Discussion/@comment-31483225-20170323191947/@comment-30737249-20170624152811

HP is sort of in a grey area in that respect, as it is very clearly a part of the game itself. ATK and DEF in the code obviously can't be counted however damage has as much as an affect as HP does, and damage can sometimes be scripted.

But it doesn't matter if HP is canon, because this is talking about how much HP he has. He physically has 1 HP, that's that. Whether he can actually withstand large amounts of damage in-game in another story.