Ah! I hadn't see that post (I'll have to go find it now :D ) I suppose it makes sense that those contracts might prevent the Master and the guests of the hotel from getting sick, or lessening/ curing any existing sickness, but it would likely still harm Asterion considering the Labyrinth is meant for torture.
It's strange sometimes I forget that the Labyrinth is still meant to be torturing Asterion, because I get too focused on how it has become the Hotel, which is meant to be a place of healing for others (at least that is what Asterion is trying to turn the Labyrinth into).