The @ReleaseTaggerBot Phabricator account should have a bot flag because it is a bot.
This requires someone with DB write access (and that is not me) to run
UPDATE phabricator_user.user SET isSystemAgent = 1 WHERE userName = "ReleaseTaggerBot";
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...and https://gerrit.wikimedia.org/r/plugins/gitiles/labs/tools/forrestbot/+/refs/heads/master/forrestbot.py#38 looks correct enough to my eyes to survive a switch from standard user to bot.