Purple named users get their posts auto-approved because they have a solid history of providing quality uploads. This is just another case of someone failing to spot the machine tells.
Bit sloppy imo, the left shoulder, phantom lace on the right side of the camisole, inconsistent hair transparency, and perfectly hexagonal lens flare should have raised a red flag.
Not defending AI art but the fact even Contributors who have uploaded countless works here are getting tricked by AI art shows that prompters and to a lesser extent the software are only going to get better over time. I don't think established users at least should be punished for not realising.
Also note the complete lack of hands and the 'blurring' filter in this one, this prompter knows what he's doing
To be fair, perhaps he was unaware of this "artist" being an AI prompter that even other Contributor-level users posted from this person by mistake.
(Contributor is one-level above Builder where they can posts without entering them through queue and has the same purple-coloured name as Builder)
Normally I double check these things, and this was a case where I didn't. However, looking at the artist's twitter, they claim to use both AI and Clip Studio Paint, which implies their works are ai-assisted and is not automatically banned. Regardless, I honestly can't tell the difference between ai-generated and ai-assisted and some genuine artworks sometimes, and the tells for AI are becoming harder and harder to distinguish.
I suggest flaggers, approvers, and contributors also look at forum #269002 which clarifies the guidelines of AI on this site.