Oh, thanks. At first I thought it was satirical. Maybe a jab at the imperfections of crypto implementations, but I guess I was reading too far into it.

i had the same issue --- hit refresh a couple of times and i went through

direct link to the PDF file https://9d0df72831e4b345bb93-4b37fd03e6af34f2323bb971f72f0c0...

Sorry! Wasn't expecting the HN hordes. Temporarily moved to Github: https://crypto101.github.io/