Never going to happen. Never.
Making a stink about it and getting Biden to refuse to take the test might solidify the notion that Biden is hiding something.
Personally, I have a “delusion” that Biden pretends a bit about how bad off he is. Probably makes him look “courageous” and “focused” to his sycophantic accolytes when he behaves more lucidly every so often. And keeps his NIL in the media eye.
Sadly, our elections are about candidate fluff and perception, rather than substance and integrity.