What is he really basing this on? Saying a stock market crash is coming is like saying bitcoin crash is coming. Usually all just speculation not really based on anything other than opinion./
Since 1913 the US Dollar has lost 98% of its value, that's one point. There are plenty of others you'll find if you research it. There are quite a few well respected analysts pointing out that the crash is inevitable too.
Every fiat currency has crashed 100% percent of the time in history.