It won't unmount FS if the mount point is not specified in fstab
There is a special case when this can be a problem:
if during undeployment absent removes entry from fstab then tries to
unmount the share but fails for some reason. The next time undeployment
runs mount==absent will do nothing and the next task (that tries to
delete the local nonvolatile directory) will reproducibly fail with
permission denied.
https://github.com/ansible-collections/ansible.posix/issues/322