This post was made community wiki in rev 14. Edit summary says:
[Post Made Community Wiki by being edited by more than 5 different editor]
(Side note "5 different editor" (instead of "...editors") is exact quote, that's just the way how system wrote it. Also worth noting that this happened before removal of automatic CW conversion.)
The problem is, I found only three editors, not five: Jimmy edited rev 4, David edited rev 6 and all the rest seems to be done by yours truly. (For the sake of completeness, I found fourth editor but it was after rev 14.)
In a simpler case I would say it's a bug but here, I am not certain. Revision history spans three pages and I could have missed something.
Were there indeed five different editors when this post was made community wiki?