So how does one go about decompiling just about anything to (readable) sources? I've been living under a rock in case you were wondering.

Apparently LLMs are very good at decompilation. I mean it makes sense, they are trained on readable code and they understand logical structure very well. And a lot of real-world problems involve inverse thinking.

https://reveng.ai/blog/training-an-llm-to-decompile-assembly...

This doesn't sound like it's decompiled - the comments mentions a leaked source.