Love the investigation and write up.

Took me down some rabbit holes, but interesting to see the chatter about the fix here:

https://github.com/python/cpython/issues/80233

Initially you could reassign True,False but that was verboten with the switch to python 3! The walrus operator was the one simply an oversight.

https://python-history.blogspot.com/2013/11/story-of-none-tr...

Explanation from Guido himself