If you have a house absolutely full of junk, it has to get cleaned out sometime. Either before the hoarder dies, if someone is trying to help them get their life straight, or after the hoarder dies, because the heir of the property will want to get some value and you can't sell a house that is full of stuff.

Based on the article, no, they don't throw away what they can sell or salvage. He talks about this. Whatever isn't valuable, I'm sure they throw away.