Anniegetyourgun I saw a bit of that thread, including the claim that there are really damaging videos... but they're conveniently no longer on YouTube to be viewed and assessed.
Like you, I am 
about that claim.
Anything genuine, and genuinely damaging, would have been saved and re-uploaded and distributed by every means, not just on YouTube. It would have been pasted all up and down MN and every other social media space in the English-speaking world.
So, although I could be wrong, I'm going to guess that the shocking, scandalous exposé videos they're talking about are the sort which did indeed get pumped on MN, with slogans about Biden being creepy. The ones I saw were compilations of snips of Biden on stages and in photo shoots with people, including women and children. The complaint was that he was standing too close behind some of the women (and allegedly sniffing their hair), and that he put his hands on the shoulders of some of the children in the posed groups for the camera.
Now, maybe there is something wrong in some of that. It's not the same ballpark as a man who is bragging about the details of how he sexually assaults women, how he gets away with it because he's rich, and who is having to pay off women he slept with just after his wife had given birth.
But if someone's uncomfortable with being held on the shoulder or having an arm draped round them during a photo or while being spoken to – and a lot of children and adults don't like it – then no one should be doing that.