When you delete something, you should tel in the changeset message why and from which source. If you use land registry data, you need to ask permission from the MRNF (Ministère des ressources naturelles) and from MAMH (Ministère des affaires municipales et de l'Habitation) since the data available on Données Québec is with license CC 4.0, which is not fully compatible with OBDl (OSM). However, we are in the process of getting permission from both ministries to be able to use it. But we must be patient. You can get the discussion here: https://community.openstreetmap.org/t/acceptation-du-mode-dattribution-dopenstreetmap-par-le-gouvernement-du-quebec/127403