Many of these EWD notes are hand written with a lot of mathematical notation, and no corrections. For example:

https://www.cs.utexas.edu/~EWD/ewd10xx/EWD1063.PDF

I am reminded of Salieri's reaction to Mozart's manuscripts in the movie Amadeus.

> and no corrections

There of course could have been 100 corrections. He just threw those papers out and started again. Which is what we old timers did when we wrote things that we wanted to look nice. I did this with every math assignment at uni: do the work, get it right, then hand-copy a legible version to hand in.