'Verwijder tagging' (Delete tagging) is an option that appears in the list of available actions for a match.

If 'Verwijder tagging' is present, it means that the match has been tagged with something.
By selecting 'Verwijder tagging' to remove the tagging, the match will no longer count towards your total usage.
This allows you to review more matches from the past by 'cleaning up' your count.