I don't think Orwell was prescient at all, I think he read documents from the elite planners like Carol Quigley did.

What is interesting about the geopolitics of the book is that the world might have looked like this if Hitler never existed. The 3 empires are the Anglosphere with their holdings (South America, South Africa), the USSR + Europe (we know Stalin was building a huge army in the 30s) and basically China (because they can't conquer that).

So is it possible this was an early plan for the 30s and 40s, and maybe that is why Orwell was allowed to read it? Then Hitler came along and forced them to change plans and it is not until about now they are going for the same thing they envisioned pre war.