They could easily vendor python in the excel distribution if they wanted to, though. In fact, it would be the smart thing to do from their perspective; expecting people to keep up to date python versions (and what counts as up to date and what counts as a needless forced upgrade just from typing import List for your typehints turns into : list is super plausibly arguable.)
I can’t love python after all the pain and suffering I’ve had to go through packaging things from extension modules. I’ve never had a worse experience with computers, and I used to write coldfusion and java swing for money, so that’s fucking saying something. The entire distutils ->setuptools->build/PEP517 + bdist vs. sdist is the least gratifying work in my entire career, by far. It’s not even interesting, it’s just shockingly poorly documented and your only plausible solution is “try literally everything and see which things work”. I shouldn’t have to fucking emulate a quantum computer just to ship a fucking bdist.