https://docs.python.org/3/c-api/typeobj.html#static-types says:

Also, since PyTypeObject is not part of the stable ABI, any extension modules using static types must be compiled for a specific Python minor version.

https://docs.python.org/3/c-api/type.html#c.PyTypeObject says:

Part of the Stable ABI.

I'm not sure what needs to be fixed, but something does. Can extension modules using the Stable ABI use static types now?