There was probably no bigger hit of the pandemic than the Spanish language dystopian thriller “The Platform.” In that film, the incarcerated, confined to hundreds of levels of individual concrete cells as they await a floating giant slab of food, felt not too dissimilar from the confined existence many experienced while living through the virus. It was a surprising cathartic gift during those lean months. Coming back to that perfect idea would seem like a mistake. Within the first half an hour of director Galder Gaztelu-Urrutia’s “The Platform 2,” it’s apparent that this return is indeed a grave error.