I understand your point, but even according to your second definition ("an attractive young woman"), it comes across as misogynistic.

Because simply referring to her as "the chick who..." basically implies that she is principally a "chick" -- not a smart woman, not a capable professional, but just a "chick". Outside of professional contexts, it can sometimes be fine, but in commenting on a professional article, it absolutely is demeaning and there is no place for it.