I can't find the course online, but there are two github repos with students' code:

  https://github.com/pavenvivek/Compiler-for-Scheme
  https://github.com/hyln9/P523

I did find a book ("Essentials of Compilation. An Incremental Approach"), also from Indiana University, but not authored by Dybvig, on compiling Racket to x86-64 assembly and it seems to take similar approach:

  https://jeapostrophe.github.io/courses/2017/spring/406/notes/book.pdf

Saving this textbook to hypothetically read in the future.

I so want to take that class.

Maybe it would be possible to start a fund raiser and pay him to record videos and release the materials used in the course?