I think it would be good to get some broader community discussion about the replacement of various tags for the areas of landslides with hazard=landslide, so I've created a topic for the discussion in the OSM Community Forum. If you'd like to discuss the changes, this would be a good place to do that: https://community.openstreetmap.org/t/various-landslide-tags-replaced-with-hazard-landslide/101466