I certainly felt that was a catch. As Soccer pointed out, NFL wants the play completed to the ground. If that ball comes free and hits the ground, it's incomplete. Thus, in this instance it simply passed to the defender for an INT. I was certainly surprised they didn't make an official review of it just to be sure. It almost seemed like a casual nothing burger, nothing to see here, move on type of response by the officiating crew.
The PI's seem like good no calls in that crucial time of the game. At least one of them at the very least. However, someone screen shotted a blatant hold in the end zone which would have resulted in a safety for Denver that wasn't called. And I mean BLATANT. You can't rant about the PI's and ignore what should have been a holding call in the end zone.
But, that's officiating in the 21st century.