I mean, I can see the argument. Raider was going for the ball, and once the ball is in the air everyone has a right to it no matter who has the better position. Plus, despite the fact that he had his hands on the chief, it's clear that the reason he went down is that their legs got tangled up. If you're not looking at the legs, the fact that it slows down right there makes it look worse than it was. Makes it look like he broke stride to push the guy. Refs have to call those at full speed and they aren't subject to replay. That's one of those calls that you just have to accept no matter which way it goes.
Honestly I've seen almost this exact same thing happen when the cowboys were on defense, only the cowboy caught the receiver's jersey on the way down and it was called defensive PI.