You didn't even read 6 sentences into TFA. 52/52 of the closed-beta testers of this feature want it removed.
So unless Mozilla thinks losing part of their existing user base over this is fine because they can attracting enough new users with AI to compensate then this result should be all the evidence they need that this is the wrong direction.
Firefox hasn't been relevant in the larger browser space for years now, it's a "nice that it exists" for a niche audience. It used to be the poweruser's browser, but that got axed. It used to be the privacy browser but insanely Safari now fills that roll. So what's left? Either you play to what strengths Firefox still has, or you have a management layer composed entirely of ex-Facebookers that are coming up with nonsense ideas that are just going to make Firefox fall off the map completely.
(Polls don't need to be former-twitter "you get four options to choose from" forms, polls are "what is your opinion on X?" and then if you want to restrict the answers to a fixed set for easy binning, perfectly valid. But if you don't, and you let your demographic opine in free-form, that's still a perfectly valid poll. It just means you're going to have to spend time binning those comments yourself)
Grandma doesn't know what a gosh darn fire fox is, and probably doesn't even know what a web browser is, either. And she most definitely doesn't know what an "AI browser" is.
If this is their target audience, they are guaranteed to lose to the "defaults" aka Chrome and Edge.
Before accusing people of not having read TFA maybe you should do some critical thinking yourself.
The reactions to Firefox's AI features likely range from moderately positive to extremely negative. People who feel moderately about something don't usually bother posting. It doesn't matter how many people feel that way.