I'm not even surprised the addon got flagged. The linked files in the Github issue all had file names insinuating a direct connection to known trackers (which, of course, uBOL is blocking). Whatever automated scanning tool Mozilla uses probably latched on to "oh this is Google Tag Manager" and issued the warning that is normally handed out to addons that do include sketchy scripts like these.

HOWEVER: the email clearly states:

> Your Extension uBlock Origin Lite was manually reviewed by the Mozilla Add-ons team in an assessment performed on our own initiative of content that was submitted to Mozilla Add-ons

Either that is a lie, or the manual reviewer that did the "review" doesn't understand that the automated tool they ran is capable of false positives.

Nothing wrong with automated abuse assessments on a platform like Mozilla's, but don't lie in your communications about it (or hire people who know what they're doing when it comes to blocking addons).