Hmm, I’m not sure. The XDG have put out other specifications, but when I search for “XDG” the entire first page of results is only about the base directory spec, and it seems to be a common choice of name for packages like this in other languages (Go, Python). I’m not sure if there’s anything else this could potentially be confused with?
I will also admit that I also like how “clean” it looks to me to write XDG.User.config() too vs. XDGDirectories.User.config(), even though this is a minor thing.