If someone tells you the wedding venue sucks & you should change it at the time you're picking the venue, they're expressing an opinion. If they tell you that two weeks before the wedding they're sabotaging the wedding.
The calls for Biden to withdraw came after the debate. The only consistent position for those doing so is that the debate revealed new information on how bad he is. So Stancil's position from 2020 is irrelevant - however bad 2020 Biden was it didn't prevent him winning, or governing after.
I’ve been saying since last year that Biden should drop out to let Harris be the nominee. And I worry that if they wait until October they’ll look back fondly on July as the time they really could’ve acted.