The user is using a new app that clearly has some unaddressed issues. We at osm.be are in contact with the organizers, and there's a thread on the forum where both the dev and the org are active, see https://community.openstreetmap.org/c/communities/be/61
App users cannot do anything about the lack of changeset description or tag deletions. They should get changeset comments just like any other user though, but keep in mind their only interaction with the project is through the app, so they are likely to not understand what you ask them. Address these issues and/or further discussion to the organizers (see thread).