Healing spinning by warlocks

Hey there! It’s not a bug story. If you check healing targets in this log https://classic.warcraftlogs.com/reports/MD92FyGb16Qthjvr#type=healing&fight=26
you can see how warlock use lifetap to increase healing value of healers. I suggest that the warlock healing not be included in the rating system. I know it’s so stupid but that ruin your rating system. Thank you!