No he isn’t
A true mentally ill person would’ve stood on business and doubled down
Respectfully, I can tell you haven't dealt with mental illness in people before.
Only the most extreme cases of mental illness are constantly "off". Some can live relatively normal lives....until they're off their meds. And he's made multiple references to not taking his meds. Which is why he fluctuates wildly between extremes.
None of this is an excuse for his behavior though, because he's a grown ass man. Having a constant parade of yes men around him doesn't help, either.
Fred.