Well, the fact that it can be compared to what a lot of people call the worst Ref call in NFL history already speaks volumes. (At least worst if you think the tuck rule call is justifiable).
I would say that there are a couple differences here that make this call worse. First, San Diego screw up was not a scoring play. They were given a bad call, but at least the chargers had further opportunity to stop the Broncos from scoring, granted it was in the final minutes. The Packer game was a situation where the Packers were winning, and on the absolute final play of the game, the refs awards a touchdown to a guy who who didn't catch the ball. Tate even pushed off another player to be in on the jump.
The second difference I see is that this falls on the entire referee group. The Ed Hochuli call was one ref who was accountable. He was demoted after that game. This game, all the replacement refs footlocker employees the NFL hired were clueless. One ref got the call right and didn't bother to speak up. They shouldn't have even made a defining call until reviewing the play, because they knew their initial decision was not reversible in this case.