I listened to the interview you linked with the former ref.
That former ref said the flag should have stood, but what bothered him more was Dez coming onto the field to argue without being flagged.
Asked why the officials didn’t flag him, the former ref said he thought they may have felt intimidated and that the game might have been too big for them. Sheeesh. These are the so-called “All Star Refs”.
If the refs called the Dallas Philly game correctly on Thanksgiving, Dallas might have had the weekend off.