I am quite confident it is the same guy because I subscribe to the
Perl tag on SO, so I easily notice that certain question topics, grammatic defects and idiosyncratic expressions (most notably "Please do help me") are recurring. Almost all questions are heavily edited to improve the English, so check the original revisions.
I conject the user is abandoning each account voluntarily after experiencing backlash (downvoted questions etc.). To preempt the obvious point of discussion, there also was no ban AFAICS. I haven't "called him on it" yet, i.e. reveal that I think I know that it's the same guy on different accounts.