I believe my MIL is a hoarder. (My husband & his sister agree). My FIL is the one that keeps the house under control. He throws things out behind her back & has other items meticulously organized. There is still far too much stuff in their home & on their property, but if it wasn't for him we'd probably be calling A&E. FWIW, I think part of it has to do with her being one of the older kids in a very large family, & not having a lot of space or things of her own growing up.
As for the woman who was s****ing in her own tub...I think the spectrum of "hoarder" is a wee bit too wide. My MIL may be a hoarder but she would never do that. That woman is seriously mentally ill & calling her problem "hoarding" is ridiculous.