It has been ready for a few months now, at least since 3.13.0 beta 1 which released on 2024-05-08, although alpha versions had it working too. I don't know why this is news now.
With it, the single-threaded case is slower.
With it, the single-threaded case is slower.
The link should have been to https://py-free-threading.github.io/tracking/
What release. The last release of CPython was 3.13.0b3 on 2024-06-27.
SciPy is irrelevant to the title.