The footer alludes to that: "Peter Norvig (Copyright 2001—2014)"

I tracked the page on web archive, and it existed at least since 1998. Here is a funny edit over the years:

  1998: Let's analyze what a title like Learn Pascal in Three Days could mean:
  2009: Let's analyze what a title like Learn C++ in Three Days could mean:
  2014: Let's analyze what a title like Teach Yourself C++ in 24 Hours could mean:

:)