It’s not a horse collar, the no call was correct. While he does grab the jersey in the nameplate area, he lets go, and McCormick falls forward. The rule states you must grab the player AND immediately pull the player down. The rule was put in place to prevent knee and ankle injuries that were occurring when players were being pulled down from behind. Here’s the wording of the rule:
ARTICLE 15. All players are prohibited from grabbing the inside back collar
of the shoulder pads or jersey, or the inside collar of the side of the
shoulder pads or jersey, and immediately pulling the ball carrier down.