Funnily enough, he didn't, that was just his propaganda.
Biden is definitely not, eh, good. His support of actions is the Netanyahu government is a very bad point, but he has shifted somewhat on it. He has some good points as well. He's the best and most progressive president of my lifetime, but that's because the office has been dominated by sleazy neoliberals and conservatives for a long time. It almost feels like "good" when we get not-as-bad after all that. We will see what he does in the next term, when he doesn't have reelection to worry about - that will be the true measure, and I'm really hesitant to guess which way he'll go.