The plakar rm command is used to delete a snapshot.
plakar rm <snapshotID>
Removing snapshot a9:
$ plakar ls
2023-08-13T08:26:12Z 227b0536 13 MB 0s /bin
2023-08-13T08:26:13Z a946463d 13 MB 0s /bin
$ plakar rm a9
$ plakar ls
2023-08-13T08:26:12Z 227b0536 13 MB 0s /bin
$