contractions - Was "Do not you want to know..." correct 200 years ago, and is now incorrect?

"Do not you want to know who has taken it?'' cried his wife impatiently.

-Pride and Prejudice (1813)

According to one of the answers in
Is "Don't you know? " the same as "Do not you know?"?, "Do not you want to know..." is "ungrammatical; you is not heavy enough to shift past not". 200 years does not seem to be that long. When did this happen?

I do not like contractions, so I would like to use "Do not you.." but all the sources say I should use "Do you not..." instead. I am just curious how "Do not you..." became incorrect within 200 years.