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I just checked the newest release on csdb and it has a .s source file you can download. It is released under the GPL. :)

Wish granted: https://csdb.dk/release/download.php?id=260085

It's even GPL.

And so is the new version: https://csdb.dk/release/download.php?id=264898

I couldn't find it when I searched earlier, but it's there in plain sight, among the other downloads!

I 100% expected a link to a git repo. Google was also, as usual, useless.

I haven't looked at it but I bet it's written in handwritten ASM. You can disassemble that. It probably won't be easy but with a memory map of the C64 and 1541 you could tell how it's working and learn from it.