Wait… chosen using ranked choice voting before the convention? How would the convention voting go? The delegates are still pledged to Biden so the first round would be a dead letter and then they’re all unpledged and not bound by any pre-convention anything.
Functionally they would be (first round is a wash no matter what, then it’s a free for all).
But there’s nothing to force them to adhere to the outcome of the ranked-choice vote.
I also can’t imagine who’d want to run against Harris in that “blitz” and run the risk of actually winning the nomination over her. I’d rather get kicked in the balls repeatedly than be “white dude who stole the nomination from the first black woman vice president”.