I completely agree about a lot of math books seeming too abstract. I hated math until I took an interest in physics and realized I needed math to understand the ideas being presented. Suddenly it clicked that the math was actually a way to better represent the ideas, not just a trick for getting answers. Seeing how math applies to create and represent knowledge gave me a huge appreciation for it.
I hadn't heard of the theory before but in googling it I came across this video[0] from mid 2019 where he claims the demand for US dollars will be driven by rising interest rates and a shortage of dollars. Obviously things went a very different direction in in the past year and a half or so as the Fed has kept interest rates low and monetary supply has increased. So it's odd to see him arguing in the video that you linked from late last year that the same outcome will result from very different circumstances.
