The "football move" was put back in the rule book in before the 2016 season.
A player has the ball long enough to become a runner when, after his second foot is on the ground, he is capable of avoiding or warding off impending contact of an opponent, tucking the ball away, turning up field, or taking additional steps.
It was reinstated after a one-year hiatus, because of all the problems officials had trying to determine whether the receiver had established himself as a runner without an observable act to base that on. Blandino hadn't realized the importance of having an observable requirement, probably because he's never been a field official. Now, officials are back to looking for the football move to complete the catch process, as they had been doing until the 2015 season.