What it actually demonstrates is the increasing incapacity of people to conceive of privilege in other than racial terms. These books are about court or high bourgeois sectors of class-stratified, mono-ethnic societies where "whiteness" is an obvious anachronism. https://twitter.com/AliceFromQueens/status/1281232965981409281 …
It's an interesting question whether the very narrowness of the milieu of Austen's novels isn't itself a judgement on it, one that the novelist was aware of. Mansfield Park is about both the security of the milieu & its limits.