If you cannot verify or uninstall the game it might be because you are not logged in to an account with ownership of the game. It is happening quite often, as Epic allows you to sign in with email, Gmail, Twitter, Facebook, YouTube, Xbox Live and various other sign-on methods.
Not sure what you mean. I played the game few hours before the patch on the same Epic log-in as always.
I can currently verify Shadowrun Hong Kong, which I have “owned” on the same Epic account I made for Phoenix Point when it was released there. Still not able to verify or uninstalle PP.
Just to follow up on the OP - for unknow reasons I have just an hour ago been able to uninstall and reinstall the game on Epic. No changes, no nothing. No explanation.