This was always the plan. They will contest any replacement and then only Trump will be on the ballot. AOC tried to warn you fucking people. This is why Biden needed to go over a year ago and the PARTY said “fuck you guys” until it was too hard to fucking ignore.
Besides, in a pinch couldn’t Biden step down and make Kamala the incumbent, and then they’d have to very stupidly argue that the incumbent wasn’t a valid candidate?