Reading his blog post it seems to me like he is commenting on Israeli state politics and the extremists within its borders rather than "any" jew. Yes he uses the word jew in a general way, which of course is unfortunate as Israel does not solely consist of jewish people.

His points are presented without hyperboles, and while they certainly do not paint Israels state politics in a good light, how is this anti semitism (which in wikipedia is defined as "hostility to, prejudice, or discrimination against Jews")?

Antisemitism is of course as inexcusable as any other form of racism, but criticism of a country's or groups political views and policies is not hate nor discrimination.

In my opinion his removal is an overreaction, but with how polarizing this subject I don't see how it could have gone any other way.