If this author is full of it, please do let me know, but… This was a fascinating read.
Linguists in the age of nationalism had real influence in a way that’s nearly unimaginable today, because the accompanying standardization handed people useful tools they had a reason to wield. It reminds me of the Korean alphabet. See also the creation of modern Hebrew. What are the conditions today that could use new tools? This wiki points to some grassroots innovation around the digital world and Cyrillic…
I skimmed through the article and the premise is right. I also think the starting analogy comparing American and British English is a fairly good one. It’s happened in multiple parts of the world that national politics have gotten people in different countries who speak the same language to claim that they speak a different language.