To be fair, it sounds like it might have been a consensual open marriage.

Retroactively. The dude found out the details on live TV. And he likely only gave “permission” because he knows Jada would run away and steal his kids if he protested. She could bury the kids in the church of Scientology if she wanted, and he’d never see any of them again. So at best, it was consent-by-coercion, which isn’t consent at all.