Alzrius
The EN World kitten
I know Pundit and often find him annoying so I tuned him out several years ago. But I have heard that he worked on a book that had a transgendered character on the cover. And that he treated the subject matter with great sensitivity. I don't know much about Zac.
I'd never heard of The RPG Pundit before this, but I've been reading Zak's blog intermittently for several years now. In that time, I can honestly say that I've never seen him exhibit anything that remotely resembles the bigotry being ascribed to him. The worst I can say is that he can be assertive to the point of being aggressive when debating a point, but that's it (and in all honesty, I've seen plenty of people take that sort of behavior to a much worse extreme).
This article is a response to the one the OP linked, written by someone who knows Zak. It paints a much better picture of the man, and a much poorer one of that article.