I have had some Facebook posts called spam, I have been able sometimes to go to the notifications from a computer only not a phone or app and go back to the post and there was an option to mark it not spam and they did make it reappear or at least they made it look like it reappeared LOL
I told them it wasn’t spam and they (the computer) told me they would have another look at it but that’s as far as it’s gotten.
They did the same thing with me over “release the memo” memes that I posted.