Absence of evidence is not evidence of absence! We're on this thread because Cisco is sponsoring piles of tokens at the problem. No such megacorp sponsor exists for this problem for Python. The megacorps have decided not to sponsor that specific problem.
Google has their own dialect of Python that they use internally that could stand to be faster. Microsoft also uses Python all over the place. (GvR has worked at both of them.) Both of them have, at one time or another, sponsored teams to make Python faster, along with Meta. Just not for the above specific cause.
I imagine it has been, but they didn't release it because the diff is too big to be accepted into regular Python and it would cost more to fix it than use it as is.