We just had a discussion about this in https://community.openstreetmap.org/t/various-landslide-tags-replaced-with-hazard-landslide/101466 after another user replaced the natural_2=landslide tag with hazard=landslide. Those two tags have different meanings and purposes, as I'm sure you can see in the Wiki.

I agree that the natural_2 key is not ideal, but if you weren't able to verify the nature of this feature using a reliable source before making the change, I would propose to revert it.