The grammarian movement, in general, was built on elevating a very specific form of English over others.
Hmm, I'm curious: which form of English do you propose Python should standardize on? I agree that for code comments it may not matter much, but it probably does for documentation. There are people who routinely make small edits to the docs, and they probably do with some kind of standard in mind (even if it's not "S&W").
Is the intent of the change simply to stop saying "we're following rules told by grammarians"... but to still follow them, just without saying so because it makes us feel better?
I'm also unclear how the very brand of English you're using is different from the "white supremacist" brand of English that "is propping up a hegemony that affects multiple axes of oppression". Perhaps that's because I'm a non-native English speaker.