Donald Knuth, Turing Award winner, author of the The Art of Computer Programming, original author of the TeX computer typesetting system, and many other impress

Donald Knuth, Turing Award winner, author of the The Art of Computer Programming, original author of the TeX computer typesetting system, and many other impressive works. Is well known for not using email. https://cs.stanford.edu/~knuth/email.html https://cs.stanford.edu/~knuth/email.html I suspect this is what they are talk about.