I assume you caught the point that doesn't always happen in the second half of -7 years.
You can play the seasonal probabilities or ignore them, that's up to you, but I can guarantee you won't be around 200 years from now to take advantage of the fictional "Total Nominal Return Indexes" in your chart, which is made up of an ever-changing mix of stocks that no one would ever actually invest in even if they were to live eternal. Doggy stocks are dropped from indexes over time which inflates their performance artificially, not to mention that fact that nominal returns are meaningless in a world with inflation.