He had to have been given the questions per DNC (unwritten) rules. Otherwise he couldn’t have kept up and recovered from word salad gaffes.
Now that I don’t disagree with. But the fools babbling about him wearing a wire fail to realize that this tonight was peak Biden, he could muster the mental horsepower to simultaneously listen to verbal information in his ear and speak as coherently (!) as he did.
And the mute button was not a factor at all.