From the comments here, I think most people just read the headline.
The article looked at 50/200 day simple moving average crossovers on the S&P 500 index (using SPY etf). Which are really just indicators of momentum. Buy when going up, sell when going down. This underperformed just buying and holding the SPY 480% return versus 520% over the last 25 years. However, it avoided big draw downs, so the risk adjusted return was better. In other words, it works in a world with no trading commissions and no bid ask spread. Is it worth it in real life? Probably not.
The article looked at 50/200 day simple moving average crossovers on the S&P 500 index (using SPY etf). Which are really just indicators of momentum. Buy when going up, sell when going down. This underperformed just buying and holding the SPY 480% return versus 520% over the last 25 years. However, it avoided big draw downs, so the risk adjusted return was better. In other words, it works in a world with no trading commissions and no bid ask spread. Is it worth it in real life? Probably not.