In a rare case, you could be on to something.
I assume the Covid is real but so is Adam Schiff favored to become a California senator and close ally of Nancy Pelosi's public call for Biden to withdrawal from the nomination. Schiff doing that is a big deal.
Biden can't drop out too soon after the assassination attempt because the optics of dropping out being related to that would be very bad. He also won't do it before the end of the republican convention.
But it does seem at this moment anyway, that what seemed like Biden holding stubbornly firm could well be slipping away.
Yes if he does, for better or worse, we'll probably be stuck with Harris.
But Harris with a decent VP instead of Trump's VP pick which was celebrated in the enemy capitol Moscow with glee, puts the democrats on at least an even chance to stop the maga fascist takeover.