This won't hurt him. His popularity and support is going to skyrocket after this and he will win in November. Bigly.
I don't know about that. Certainly the cult members will just become more entrenched in their position that he's the messiah rather than a very naughty boy, it plays in to the narrative that the powers that be are out to get him (which I suspect is mostly true, but it's also true that Trump's behaviour has given them plenty of ammo).
But it may give people in the "anyone but Biden" camp pause.
Overall I still feel he probably will win the election, but I don't think his support will skyrocket - it will just make his cult following dig their heels in more.