> in order to make a 10000x return requires a strong belief that Bitcoin will actually go that high. Because to reach 10000x you have to resist the strong temptation to cash out at 10x, 100x and 1000x.

Indeed. The article gives no rational explanation for why someone shouldn't have sold at $11,600, or why they shouldn't hold on and wait for $1,160,000. Saying "If you bought at the start of the bubble and sold at the peak you would have made a ton of money" is pretty meaningless, especially when the reasons for buying at the beginning weren't great ("If Bitcoin becomes the new global monetary system"/Bitcoin "eventually replacing a decent size fiat currency").

You could have a system for pulling money out (as a comment mentions), but that involves a different understanding of Bitcoin and also involves earning less money than the article mentions.