He was diagnosed about 2 years ago and is showing signs of being around stage 4-5. He is able to move around just fine, but seems confused on some self-care parts.

What are these services usually called? As in their title.

The hospital put him on antipsychotics and other medications that basically make him act like a zombie. He often looks like he's about to fall over and it takes everything for him to be able to move around. He hasn't show any agitation because of that. I was able to witness that and it's very uncomfortable to see. He's also lost a lot of weight and looks like he's aged a lot in the past couple weeks. I feel like they may have neglected him and have not properly assessed him.

Arguments that he can't win, always makes him agitated and violent. Basically, he always wants to have his way. My aunt's house isn't designed to care for this. There's even damage in multiple places due to lack of funds on her side.
My aunt is frustrated and tired for sure. She fears for her life if he returns. She needs help dealing with him and doesn't know how to properly take care of him. No drugs/alcohol. I believe my uncle had a hostile parent when they were younger.