He's got 'some' bjj experience, but Dana is taking a punt on him for purely the entertainment factor. He'll probably give him a can for his first 1-2 fights, but as soon as he meets anyone in the top 10-20 he'll get destroyed. He's no wrestling background, he's not an ex athelete, he's not done any competitive fighting, he's just an actor on steroids.
They've lost quite a lot of 'celebrities' from the sport over the last couple of years and PPV numbers are dwindling, so they're attempting to prop it up by employing clowns. They'd have been better off hiring Bobby Lashley if they want to do something ridiculous.