In summary: someone with a GitHub account discovered that you can hijack the C pre-processor (give or take some GNU language extensions) to transpile BASIC/PASCAL/ALGOL like languages to C. They call their macro collection "evil" and ramble about destroying C, trying to create some form of mystique I guess.

The idea by itself is nothing new and pretty much any novice C programmer eventually stumbles across it. Famously, the original Bourne Shell was written in a variant of ALGOL68, fed through a C compiler using macro based translation[1][2], which helped spark the idea for the IOCCC[2].

[1] https://en.wikipedia.org/wiki/Bourne_shell#History

[2] https://en.wikipedia.org/wiki/International_Obfuscated_C_Cod...