Lol, all the people squawking about how this means nothing and this is a worthless project amuses me. A lot of people just don't see it yet. This is coming for literally everything and it is so exciting. The next decade is going to be awesome.
Basically the entire Python ecosystem has deep integration into implementation details of CPython, if there was a runtime independent api like HPy, then the effort would be better spent migrating to it rather than building yet another half baked JIT.