There's more evidence to suggest that it is someone from MLK, possibly even someone who signed up just for that specific purpose.
I mean, it's not like stuff like this hasn't happened on here in the past.
And I don't think it even really matters, if it was someone from here then they would be smart not to admit to it and if it wasn't anyone from here then it still stands as a reminder that while we do hide personal information from guests, there is nothing stopping anyone with five minutes to spare from creating an account and being able to access it all.
That's just my opinion on the matter