The reviewer asserts that the addon transmits data. It does not.
That may not be malice, of course. It could just be incompetence (someone running an automated scanner and not verifying that the results are correct), someone trusted with a job they're not capable of doing, or maybe it's just Mozilla pretending someone reviewed the addon while using shitty AI like ChatGPT to do all the work.
The email even directly links to resources that are supposedly "minified, concatenated or otherwise machine-generated". That's simply not true.
Maybe it's the fact that 80+% of Mozilla's revenue comes directly from payment by Google who are extremely hostile to ad blockers (and UBO in particular) at the moment.
That should be obvious, honestly. The extension is a threat to the reviewer's paycheck...
UBO isn't even the extension that was scrutinized, and besides how do you even know that the reviewer (if they are a human which seems open to question) is a Mozilla employee rather than a volunteer, and that they were not acting out of sheer incompetence?
You can be familiar with Hanlons's razor and disagree that it is a good rule for dealing with faceless corporations. If you excuse everything as bening incompetence then that's exactly how malicious actors will hide.
It's unclear why the author of the article decided that the word 'mistake' deserved the scary quote treatment.