I clicked it so you don't have to. He doesn't actually answer the question in the title, but the closest we get is this:
I had a couple people say [while I was streaming] that there was a guy on Twitter being like, “Charlie Kirk just got shot in the neck at the event I’m at.” And I was like, “There’s no way.”
He also talks generally about Kirk (who he was going to debate in two weeks), death threats he's received, and having to see gruesome stuff like the neck shot video.