I didn't actually see any evidence of Facebook censoring content because it's insulting to Ataturk on the linked page. The "evidence" appears to be a document that doesn't mention Facebook anywhere, but, let's take it as read that this really is a list of Facebook content abuse standards.
Even with that assumption, things related to Turkey are not listed as always banned. They are under a section labelled "escalate", meaning, if it gets hot, send it to management.
It may well be that Facebook has decided to enforce Turkish laws about this in order to get themselves unbanned there. But it may also be that upper management just wants more precise control over this hot potato. Once I see a clear message from Facebook saying a group was suspended for violating Turkish censorship laws, then I'll agree.