Where are you getting this information that mentioning Yaxley-Lennon's alter-ego gets the post deleted? Appears to be nonsense to me, I have seen plenty of posts with that name in them.
Can't blame you for finding this strange, it has not been reported widely since Tommy acquired his well deserved pariah status. But you will find it on the second page or so using a internet search provider of your choice, predictably on unsavory pages that also might call for the death of large portions of the worlds population solely on basis of their beliefs. You efforts might lead to tweets like these:
https://twitter.com/blondesoulbird/status/115134913120768409...
But I can also assure you this happened to the moderator of a group I'm in (he did it as a test to check the veracity of the claim). He typed "test Tommy Robinson" in a post to his friends. His account was disabled for 3 days.
Certainly not the case in the UK, I literally posted "Just testing: Tommy Robinson" yesterday after seeing your reply; post was left intact, friends can view and comment, and I'm not locked out of Facebook.
But I can also assure you this happened to the moderator of a group I'm in (he did it as a test to check the veracity of the claim). He typed "test Tommy Robinson" in a post to his friends. His account was disabled for 3 days.
https://www.facebook.com/groups/kallkritik/permalink/6131282... (in Swedish)