He is really a bullish person but I'd never think this gonna happens in real life. $350k-$450k is not realistic for me but he stands it comes possibly as he relies on History repeats itself scenario.
Should we have to believe this?
In a highly volatile world, anything can happen, and expect unexpected things to happen, we are always shy of one big event happening to reach our downfall or reach our goal if that's his analysis and expectation then so be it, you should have your own analysis and you can base it on other expert's analysis, the most important is to see all sides to come out with the best action based on proven analysis, experts are not perfect but can contribute to your analysis.