> These objects are also compressed to save space, so writing to and reading from .git/objects/ will always involve running a compression algoritm. Git uses zlib to compress objects, but looking at competitors, zstd seemed more promising:

That's a weird thing to put so close to the start. Compression is about the least interesting aspect of Git's design.

When you are learning, everything is important. I think it is okay to cut the person some slack regarding this.