That is simply false. I believe something like that happened at some point with one of my edits. I edited a question, went away because I didn't have the time to carefully review it and write corresponding comments and there were some comments already. Someone then proceeded to write something like "This has already been edited by a mod so it must be on-topic."
It was funny, because I am not a mod, but also weird, because if I am a high-rep user that mainly edits (and I am such a person) then me editing something is by no means a statement for the question being on-topic or the answer being…