The buffs I agree are much needed, but I don't really see him as a viable character still. I say this only because of two things: his mobility and his recovery. With his tiny hitboxes and difficulty with approaching, Doc's modest mobility still leaves a lot to be asked for. The only buff that could have addressed his poor neutral game would be the quicker super armor on his down-b. It was already a pretty great move and I'm glad to see it buffed, but it won't help him too much.
As for his recovery, it is still one of the worst in the game, in part thanks to his tiny jumps. With so many good characters in the game, one's recovery makes all the difference. The buffs didn't really address this issue at all.
All that being said, he is still easily in my top three favorite characters in this game. I love him and don't know why.