Also should be noted other reputable science-based algorithm designers like Nate Silver advises Biden to step down.
Nate’s algorithm is just a poll of polls. And his reasoning is incredibly short term and superficial.
Nate wasn’t suggesting Biden drop out back in January when other candidates could run to replace him. He’s only saying it now, because Biden’s polling is at an all time low.
If Biden recovers (likely, as the memory of the debate fades behind other current events) the pundits will start singing a different tune quickly enough.