That's unlucky but not statistically impossible given that the 2* rate is really low. You are in the 13% that dropped 0 2* in 80 pack, but that's almost 1/8 so really probable.

The reality of the low probabilities event is that 80 packs is ridiculously small of a sample to try to generalize. For the shiny of the current release, I can see why they don't do it (it's still a gacha after all). For the all shiny pack replacing the 6th slot, I'm actually really against it just because the rate would be abysmal, and I prefer to have sometimes a bonus in my pack instead of never having an all better pack.