The BBC actually has a timeline of the Pizzagate debacle, which if you remember or didn't know, was complete bullsh*t that didn't hold water or even pay attention to simple details, like the fact that the building doesn't have a basement.

And as for the peeing thing, what I can gather is that it's not that, it's that he hired hookers to pee on the bed because the Obamas had stayed there, some ridiculous, childish thing like that.  And I could see him doing that.

Now this dossier isn't confirmed, it could very well be false.  It does feed into the narrative that the Russians might be extorting Trump, and fits in with other patterns we're seeing, but this information itself we don't know if it's true or false.  We also have to bear in mind that the Intelligence Community is not happy with Donald Trump right now since he's rather dismissive of them and has made mention of wanting to reshape some of the agencies.

Quite frankly, I think the only way to know what's going on is to wait 20 years and read about it in a book... of which I'm sure there will be several.