This seems to be mostly a dressed-up variation of Intermarket analysis. However, this is more structured in that it attempts to spot trends before they occur by effectively using the metals market as the primary market that underpins all the other markets. In-itself it seems like a smart idea, I personally cannot vouch for this as this is not a strategy I have backtested myself.
However, I would not say the idea of Intermarket analysis is revolutionary or something brand new. This is because there have been a few words, on it (though, not as many as there could be in my opinion) with the most famous one being by “Intermarket Analysis” by John Murphy.
Arguably, Stanley Druckenmiller subscribes to this approach as he said this during a RealVision interview:
One of my strengths over the years was having a deep respect for the markets and using the markets to predict the economy, and particularly using internal groups within the market to make predictions. And I think I was always open-minded enough and had enough humility that if those signals challenged my opinion, I went back to the drawing board and made sure things weren’t changing.
If anything, I would argue that this certainly makes a strong case on how Intermarket analysis has a place in any market strategy.