Thanks for the quick response, I was able to build and get it to run. Although I think it's psychopathic to make people go through that much work just to mimic the setup in the above video. I will just leave the below links for convenience for anyone struggling like I did.

https://www.mediafire.com/file/ry65celpzubfgae/randomizer-speedchoice.zip/file (compatible randomizer) https://www.mediafire.com/file/c7yokdz3s7hppw3/red-speedchoice.gbc.zip/file (rom)

anyone have the links in 2021? The above are broken :/