It appears to be the Community
I have had one of these edits on one of my answers. It was from Anonymous correcting my misspelling of “Silver”, i wrote both Sliver and Silver in the answer.
I accepted the edit and, as i was the author of the question, it was automatically accepted. I went to check the answer i wrote and it said “Edited by Community”, meaning the Community User.
However, the Community left me a message
In the edit, i had a message that seemed personalised towards my answer. Normally when making an edit to a post, you put in a description of what you have edited, such as “improved formatting” or “corrected spelling”.
The edit description i got was “Silver not sliver ;)”. This seems like a very strange message for a bot to put in. Either someone has had to program the Community User to write that specific message or whoever wrote that was not a bot. Yet the edit still says it was from the Community user when accepted but said it was from Anonymous when it was suggested.
Look at these images below and see for your self. Take note of the date and time the Community User’s post was approved (Apr 9 at 17:24) and when i approved the Anonymous edit (Apr 9 at 17:24).
This seems to be definitive evidence that the Community User is the Anonymous editor. The personalised message concerns me though, either the Community User is smarter than we give it credit for... or there is a puppeteer behind those strings...