POI almost never occupy a whole building unless it is a single story and specifically built for that POI (some restaurants, malls, most bigger supermarkets etc.). This one is a two story house. I doubt that they occupy both floors given the fact that it has been tagged as house.

The change of amenity to disused:amenity is easy but you also have to clear all other POI tags which takes a lot more time when you have it merged with a building since you have to make sure that you are not deleting the building related tags.