You could very well be correct, perhaps the leaders of these countries are living in the 19th century. But the fact that the current leaders of Ukraine, USA and Russia are acting in line with/on these older assumptions makes them relevant still today.
Also there’s plenty of information backing up his claims in the book, you’re welcome to go read it. It’s an excellent window into the way geopolics is rationalised, written by one of the people who have shaped it!