If loved one is uncle with no spouse, how do you encourage him to move to assisted living?

Sherwood Park, you cover your own axx by seeing a lawyer NOW. Talk about getting emergency guardianship to place him in a safe facility. Without that, if he leaves AMA and gets hurt, you will pay a lawyer to defend you in a neglect charge from APS.

Sherwood, in your title you asked how does one know if someone has dementia. Here is an excellent article to give you some tips of what to watch out for: https://www.agingcare.com/alzheimers-dementia#signs-and-symptoms-of-dementia

With my Dad, who was 95, for him forgetting what day it was was no biggee, that happens when anyone retires as each day is the same, so don't use that as a guide of his memory. With my Dad, it was in the late afternoon and/or evenings he could call me saying he was at a business meeting and missed his bus home, so he will stay the night at the hotel. Well, Dad was calling from his Memory Care suite, thus I knew his mind was back in the 1940's.

Oh, if your Uncle walks out of the hospital not following the rules to have 24 hours care, and his health insurance finds out about that, the insurance may not pay for any future care regarding the certain medical situation. Curious, why was your Uncle in the hospital?

Question to Jeanneqibbs: What happens if uncle leaves against medical advice, (POA does not take him) uncle moves back to his independent apartment (senior's apartment who knows something is amiss) and some unfortunate incident happens to him? POA is not responsible, correct?

He can always leave against medical advice. If he hasn't even had a diagnosis of dementia he is not likely to have been declared incompetent.

The hospital may try to pressure you to take your uncle. Do not give in to the pressure!

Question to Jeanneqibbs-if uncle does not agree with hospital discharge planner and social worker, of option of not living alone, then he cannot be discharged and will have to remain in hospital, correct?

A POA cannot determine where someone lives. The person holding healthcare are POA (aka medical proxy) can make that decision when the authority goes into effect.

But is the hospital will not discharge him to live alone, then he is going to have to pick some other option, right? The hospital discharge planner and social worker should work with him to help him understand his options. If, based on that, he agrees to go to Assisted Living, then the POA can arrange that.