Wow... that's... crazy.

Very sorry to see that a loved one of yours has suddenly succumbed to this.

:(

Well... a sudden onset of delusional and paranoid thinking like this (complete with the embracing of whacky conspiracy theories, including the insanity that the Earth is flat, and equally outlandish ideas) is often triggered by a sudden major stressor event.

Sudden unemployment, combined with a global pandemic are certainly a perfect storm that will do it, in susceptible people. (And I suspect that's at least part of the reason as to why we're seeing a sudden spike in QAnon, as people around the world face those exact 2 stressor events in a double-whammy.)

ALSO: it's interesting that he's older, and yet he's just now snapping like this, in response to stressors.

I suspect this probably isn't his first rodeo in that regard--he's probably had at least one, and perhaps a few such incidents in his past, perhaps?

Anyways... whatever the psychology involved... you need to think about your own safety and happiness first.