H153 looks like it's been mis-configured (from what I can tell without admin access).
I think it's meant to add @TerraCodes to new tasks which are in "ArticleRatings, Brickimedia, DeepSea, Discussion-modeling, Dumps-Generation, FR-Campaigns, GlobalContribs, Increasing-content-coverage, MediaWikiChat, NewTalkGlobal, NumberOfComments, PAWS, Refreshed, Reports-bot, Snippet, Splash, Timeless, USERNAME, WMUA-Community-Support, WMUA-Contests, WMUA-Partnerships, WMUA-Tech, Wikimedia-DC, procurement (!)", but instead it's doing an OR on the conditions and a NOT on the list of projects – so they get CCed on any new task, and any task not in that odd list of projects when it's edited.
Can the user disable it, or failing that, a Phabricator admin do so?