It was not a reviewable call. If you watch the replay in real-time, his hand was near Rodgers mask, Rodgers head turned with the hand, then Rodgers whole body turned and he went down. I think any reasonable individual would've made the same call. When replayed in slo-mo it was obvious that it was a brush on the mask and likely wouldn't hold up as a face mask violation but that review wasn't available to the ref. IMHO, it's a reasonable call.
Of course, that only afforded the Packers the chance to try a last play. The odds were very much against that play ending in a touchdown like it did.