All posts that you have shared and have been modified (after a while) are archived, so changing quote post will not help you to hide any thing.
Loyce.club doesn't keep track of changes and edits. It only shows the original post. I checked Ninjastic Space a second time with a post of mine that I know I edited at least 10 times. The original got scrapped of course. Only the first edit got scrapped. The others were not. Unless there is another way to check a post that got edited multiple times, it doesn't work with Ninjastic Space.
BTW, forum admins can also see post edits. I don't think the option is available for the other staff.
Can admins see editing history of a post?
Yes, though it's a bit of a hassle.
There's currently no history of profile fields, though, so you definitely can't rely on your signature or anything like that.
The response will vary from case to case, I remember once someone posted my private key, but remember that any shared reply has been archived.
I think everyone will agree that nobody is supposed to know our private key.