This is kind of behaviour is usually a symptom of dementia, but a meds check is worth while as sometimes, when someone is on lots of drugs that can cause confusion. Go through each drug, specifically check whether it is still needed and how it reacts with other drugs he needs. Many older people end up taking far more drugs then they need because drugs are always added, never removed.
Incipient dementia can be the cause of self-neglect and the problems you mention prior to his move are consistent with that. the first symptoms of dementia are not necessarily loss of memory, they can include loss of ability to care for oneself properly and confusion on boundaries of behaviour.
When a political leader lies on their CV - can you trust them?
