Can the employer file a case of absconding after visa cancellation?

If you did not join a job during the grace period.

The employer cannot file an absconding case once your visa has been canceled.

You get 30 days to exit or get a new job after your visa cancellation.

If you overstay, there is a daily fine that you'll have to pay while exiting or processing a new visa.

If he ends the contractual relationship, then he has no right to file for absconding.