The DataHoarder community has taken notice and multiple people are in the process of backing up the HomeBrew section of the site. Apparently this cannot be automated due to anti-bot measures on the site and has to be done manually, so massive massive thanks to all of them. Compilations of the contents should be uploaded to Archive.org soon.
I was reminded that Itch.io does accepts console homebrew, and in fact a lot of the homebrew projects on Romhacking were already being released on Itch as well. Romhacking removing their HomeBrew section is still unfortunate, but at least there is another place for these devs to go.