Obviously, Yamamoto-san makes his money selling $360/yr subscriptions. If he had a system for making money in the stock market, he wouldn’t waste his time selling “advice”.
Shorting has a high risk/high return profile. Too risky for me. Our friend Soros made a billion dollars shorting the sterling pound and Italian lira in 1992, but people who are no less smart than him lost their shirts (and more) trying to do the same thing before or after him. You can clean up if you’re lucky, but if not, there’s no limit to your losses.
Beware of charlatans and market “timers” who may heed your call and come knocking your door. Sensible people know that the higher the return, the higher the risk.