It's not true, obviously. I have been in DK's office, I have seen him read and write email.
So I think the content on this page is still substantially true, with rare exceptions.
From the postscript on https://ryanwaggoner.substack.com/p/could-you-delete-your-em...
Well, internet archive verifies it existed on the web in 1997.
https://web.archive.org/web/19970526031736/https://www-cs-fa...
Also, it is pretty much absurd to believe that someone who is on the faculty of a university, where all business is conducted via email, will not read email.
Basically, what he is saying is that he will not read your email.