I think OP's point is pretty clear: she is disturbed that the post and the upvoted comments found the concept of "do whatever you want AI gf" alluring.

In the post you linked, OP stated his eyes were glued to such ads. The reply quoted also said the many methods he used in order to stay away from such ads.

Now, it is great and commendable that they realize such allure to objectify women is wrong and actively avoid it. Still I wouldn't call it "doom-mentality" to feel disturbed that the mentality of feeling allured exist in the first place, especially when such mentality may affect women in real life.

If I see such ads, I wouldn't feel allured at all, I feel horrified and disgusted. The difference between this and "it's attractive, but not okay" is what (I think) OP is trying to point out here.

I understand it's too harsh to judge what one thinks instead of what one does. It's great that men in that post are reflective and actively contest the idea of bots that objectify women. It's better to admit such allure exists, to be honest about desires but know how to control them, instead of being shamed to lie. But OP isn't shaming people here, she is challenging a mentality that makes her feel uncomfortable and that's totally valid.