Syag, she never said that. Talk about reading comprehension, you missed a key word.
I quote: “In chassidish non lubavitch society, dressing tznius is not NECESSARILY an indication of sensitivity to kedusha and yiras shomayim, but an indication of communal pressure. ”
She never intimated or otherwise implied that non Lubavitch Chassidim dress Tznius not because of Yiras Shamayim, what she was saying is, is that sometimes dress is not a good enough indication of Yiras Shamayim, because outward behavior, and dress in particular are prone to being influenced by societal norms and pressure. This isn’t rocket science, it’s a very good observation.