I think you perhaps do not understand the text of 1984, never mind the subtext. In the novel, Newspeak is a part of intense and total historical revisionism in support of a coherent government agenda enforced by a powerful central authority, not a decentralized and gradual change in the language people use "enforced" only socially.
> Someone starts to lecture you about how referencing "winter" is non-inclusive to Southern Hemisphere readers? "We don't do that here".
This is a very interesting example. If you're a global company and you make your product, say, snow-themed globally during the Northern winter, it's simply inaccurate for Southern hemisphere users. I don't really see how that's a political correctness or language issue as much as a factual correctness issue.