The problem with this video is that someone went through dozens or perhaps hundreds of public appearances, cherry-picking the very worst moments. Biden is known for his public gaffes. He does sometimes speak faster than his brain works. Even so, this video is probably not very representative of him.
How will he do in a public debate with Donald Trump? That should give us a clue.
As for moral hypocrisy, these allegations of sexual assault by Tara Reade and others remain a major problem for the candidate. But if these allegations and other alleged predatory behaviors prevent us from considering Biden for POTUS, don't they as well for Trump?