I got stuck with this answer for one question.
Firstly it was this:
After 5 minutes it became this:
What is going on? How the author was changed? Was that moderated?
This happens when two accounts are merged and the source account (i.e. the one that was merged into another account) was the owner of the post.
Looking at his profile, He is suspended for voting irregularities. So probably he had more than one account which are merged.