Just to add to the above (covering 1: the infraction message you received, 2: the PM I sent you, and 3: the note in the banned/suspended members thread), you'll note that the very first reaction to the "event" was the warning you attempted to quote in the OP of this thread.
The first part of my comment was: "Extrasolar Flapjacks, going back and editing the OP...".
It should have been clear at that point who had edited the post. Why would I warn Extrasolar Flapjacks for someone else editing their thread?
(Note also that (current) post #50 of that thread is Extrasolar Flapjacks apologising.)
To be clear:
If you want to see who edited a post, look at the bottom left of it. See the attached image.
Get up, a get-get, get down.