local snapshot not restoring in APFS file system
Restoring from a snapshot happens when you run the migration assistant or boot to recovery HD / internet recovery.

Follow the restore steps from:


https://support.apple.com/en-us/HT201250


The tmutil restore command is targeted at one or several individual file copies from my interpretation of the manual page and using it in practice. It works well for "go get this file" or "go get this folder" from that specific backup and not to much for rolling back a checkpoint of the whole system or a large volume of files.