Of course my friend there is no cointegration, look at the peaks, lol. The price deviates wildly from the general trend. But does it go back to the general trend? Yes. So even your example of a parallel function is complete nonsense. The regression line goes through the middle of the price data, it is indeed the general trend. No need of stupid cointegration and fancy methods to show the obvious. Do you want to use some fancy methods? Use RANSAC to get the inliers and see if these are conitegrated. Let me know. But it is obvious if you draw lines of deviations from the trend the 50 % deviation from the trend line that it captures the price progression of most of the bear market. The price oscillates around that line. I need to write a Medium article to debunk your article soon.