I read the blog post and while the author's tone was a little bit harsh, I really doubt it can be called anti-semitic. I guess that's why they re-assigned him and he wasn't fired. You probably don't want a "head of diversity" to be controversial in that way.
That was one of the most heinous, blatantly bigoted screeds I'd read in quite a long time. There isn't anything defensible about it.
If you'd like a Jewish perspective on this, here's a comment made by someone who claims to be Jewish that basically echoes my sentiments -- that the author of that blog post was naive and got carried away in his rhetoric, instead of being an actual antisemite: https://news.ycombinator.com/item?id=27385448