Having had a look at the archived version linked below, it seems pretty clear that it's entirely hogwash:
- The referenced init system replacement is called "rye-init"
- The wiki does not have anything on "rye-init" or even just rye
- The only hit on a package search for rye is rye, the precursor to
uv - I find no general search hits for rye-init, except references to the
ryementioned above (as inrye init), and some hits for this article and forum posts with people confused about it.
Between that and the uutils-coreutils, Ubuntu 25.10 sounds like it'll be an interesting experience for users, especially those with accessibility and internationalisation needs.