Presuming he has a problem. What makes your think you think he would welcome intervention, or seek professional help, or respond to help?
He's clearly ignoring blunt feedback, and I've yet to see anything that suggests he thinks he's doing anything wrong.
Our society has been validating his behaviour with his half-billion dollar business: clearly some of his behaviour has value. Our society seems to reward and encourage similar behaviours in other founders (especially in current zeitgeist).
Sadly in my experience we don't have many options to help, and sometimes all we can do is watch someone burn themselves and those around them down.
He's losing his game and I can't see Automattic surviving the reshuffle that's coming. Business clients hate this shit and they have agency. Matt has been giving employees non-voting shares (a different class): https://ma.tt/2024/10/owner-mentality/ although he owns 84% of the normal shares (although details of control depend on agreement with investors).
The saddest thing is that I'd guess he will toxically blame Jason Cohen. I'm sure Jason can deal with it (surely dealt with in past) and Jason seems smart enough to take strong advantage of the opportunity he's been gifted by Matt.