You can delete your offers on Kaufland by removing the markets (Items > Variant > Availability > Markets) for Kaufland (or Kaufland DE, SK, or CZ).
A cron job runs hourly that collects the items and deletes them on Kaufland.

Deleting the SKU in plenty would therefore only be meaningful after this export, i.e. one hour later. Otherwise, overselling can occur, among other things, due to missing stock reconciliations.