An error message appears saying "The following are not allowed: no zionist, no zionists" when users try to add the phrase to their bios, but any number of other phrases about political and religious preferences are allowed.
When I was using dating sites, "No MAGA," or, "Trump is my President," and related were regularly seen. I frankly don't see the difference except that the current administration claims that being anti-Israel is somehow different than their own unique brand of racism.