Let me know when you find the information detailing exactly what hosts those files are deleted on... Oh, cant find it?
pveceph help purge
USAGE: pveceph purge [OPTIONS]
Destroy ceph related data and configuration files.
-crash <boolean>
Additionally purge Ceph crash logs, /var/lib/ceph/crash.
-logs <boolean>
Additionally purge Ceph logs, /var/log/ceph.
root@pve04:/var/lib/ceph/mgr/ceph-pve04#