Agreed. Most tutorials have a readable font. This one on the other hand appears to teach not a lot except perhaps an intro to linguistic cryptanalysis.
Please don't complain about tangential annoyances—things like article or website formats, name collisions, or back-button breakage. They're too common to be interesting.
It's still tangential. It's hard to read for some but there's not much point writing the Nth grumpy comment about it. And if the author is here, as in this case, you can include it in whatever else you have to say about the thing without being a jerk about it.
https://news.ycombinator.com/newsguidelines.html