Sarune, you do NOT need to post on a thread that has been grave dug to tell the person that they have grave dug. You can simply report the thread and if you really want to, send that person a PM with a link to the thread explaining that grave digging is not allowed.
I will let you off this time but please do not do it again. Normally I infract people for needlessly posting on a grave dug thread like that. Thank you.