I doesn’t matter about “private”.
All it takes is for you, a member of said “private” group, to forward that to your own “public” page for all to see. Then some self-conscious hyper busybody will get bent out of shape and tattle-tale.
Any Freeper on Facebook is a [ epithet ] fool who needs to be [ epithet ] [ epithet ] immediately. You are the product on Facebook, old fool.
Of course there is nothing to keep it private. The point is he posted on private and should never have even apologized let alone resign. No courage, none. That kind of weak capitulation hurts everyone