I wouldn’t say I agree with this interpretation - I think it’s equivalent to saying that when Elizabeth looks down on her younger sisters for being flighty/etc, it’s a “not like other girls” thing. But it’s not that, she just… correctly thinks her sisters are flighty/etc.

I guess it depends on how you understand “not like other girls.” Imo that implies a girl who’s trying to say she’s “one of the guys”, smarter/less shallow that all the other girls around her, has more “valid” priorities than the girls around her, etc. Lizzie… would never have been able to present herself as one of the guys even if she wanted to.

I think that quote is more about how Darcy would be surrounded by people who wanted to butter him up to take advantage of his wealth. Obviously in a marriage context all the people doing that would be women, which is why Elizabeth would have stood out because she acted differently than them. However, Darcy was also surrounded by men that wanted to take advantage of his wealth - for example, Wickham. But in a specifically marriage-centric context, Wickham and other men were irrelevant. Similarly I would say Wickham could be considered socially “crafty” - but as with the women that quote is alluding to, it’s not presented positively.

Idk I get what you’re saying but I think one of the things Austen does really well is show how the complicated social norms of interaction encouraged “social craftiness” but it’s actually better if people, both women and men, can just be honest with each other - but of course even social pressure aside that’s very hard for Austen’s characters to do.