I stand corrected, he hasn’t been forced to sell yet, but he’s under investigation and they’re tons of stories out there about him being forced to sell. The NFL can force an owner out and force him to sell.
Leonard Tose, former owner of the Philadelphia Eagles was forced to sell in 1985.
https://www.latimes.com/archives/la-xpm-2003-apr-16-me-tose16-story.html
That article says Tose was forced to sell the Eagles because of his gambling debts, not because the NFL made him sell the team.