I doubt it has anything to do with being a hoarder’s house.

I’d bet it has everything to do with being a hoarder’s house, because an end-stage (severe level 5) hoarder’s house is only suitable for tearing down. The person who buys the place is buying the land, as well as paying for the demolition of the house.

Description of a severe hoarder’s house:

Severe Structural Damage to the Hoarded Home

There is severe structural damage caused by the hoard. Repairs that needed to be done in the past that were inaccessible or unnoticed because of the excessive accumulation of belongings have now hit a critical point. The structural damage is widespread. The floor may be caving in across an entire room or section of the house, and the roof will most likely be greatly compromised.

Extensive water damage will exist on both the ceilings and the walls. Multiple windows may be busted. Window seals and window frames will be rotting or disintegrated from water damage. Pipes will have burst and flooded areas like the basement without any objects being removed. […]

Entire walls will have crumbled in because of mold damage. The weight of the hoard pressing on the drywall will have caused beam exposure. Places, like where the drywall has now crumbled to create a hole, are filled with hoarded items.