Since logs are deleted, here are my point based on what i can find.
Perceive shitposting
Logs will be nice. I dont belive it was emergency ban tbh. there should be kick at most.
Lacking a country tag
I think that lacking it dont warrant even a kick. Admins can force change users nick to add country nick, and it should be done here.
Not being affiliated with any SCPF branch
Quoting chat guidliness: #SCP-INT is open to everyone! You don't need to be a member of the wiki to join. ~ http://scp-int.wikidot.com/chat-guidelines
So it never should be a reason to ban or kick anyone. Nowhere is said "you must be a member of SCP to join".
As well nowhere is said "your nick must be same as wikidot nick", and i saw some people talking otherwise (if somedoby needs logs as proof please ask). Just a two cents on that topic.
As well, err, how long is the ban? Perma? And user was informed about it (how long, what user can do while banned, how to rejoin/ appeal (if we handle it) etc? If not i volunter to try to do so)?
With that said, im for remove of the ban until i will be able to see logs of said incident (shitposts), but even then i belive ban shouldnt be more than 1 month.