C api has PyDateTime_GET_FOLD but cpython has PyDateTime_DATE_GET_FOLD
The C api is missing PyDateTime_DATE_GET_FOLD
because it has named it PyDateTime_GET_FOLD
instead.
pypy appears to follow what is written in PEP 495, but the cpython implementation does not actually use that name.
I have created a documentation issue for cpython as well: https://bugs.python.org/issue46201