There is no credible report that PlanB, the creator of the stock-to-flow model for bitcoin, has written such a tweet. In fact, he has recently tweeted that he is still confident in his model and that he expects bitcoin to reach $100,000 by the end of the year.
The phrase “lost all my bitcoin in a boating accident” is a common joke among bitcoin enthusiasts, who use it to avoid revealing their bitcoin holdings or to evade taxes. It is based on the idea that if someone stores their bitcoin on a hardware wallet and then loses it in a body of water, they can claim that they no longer have access to their funds.
Therefore, it is very unlikely that PlanB would experience something like that, as he is a well-known advocate of bitcoin and has a large following on Twitter. He is also known for his rigorous analysis and data-driven approach to forecasting bitcoin’s price movements. He has not given any indication that he has changed his mind about bitcoin or that he has lost his coins in any way.