Even his closing statement contradicts itself:
So in conclusion, rest assured
that as long as you are properly
diversified, your stock investments
won’t go to zero.
If you should diversify, then that shows that each piece of your portfolio has a chance to go to zero. So the combined chance of going to zero is not zero either.This brings up an interesting question: How high is this long-tail risk of a European investor who invests in US stocks? The risk that Europe at some point decides to seize their peoples stocks. Or that the US decides to not respect holdings by Europeans anymore.
What happened to Chinese and Russian people who held US stocks which they bought via the Chinese/Russian stock market? Did those investments got wiped out too? Did their governments seize those? Or did the remeining investors in the US had a gain from the Chinese/Russian investors "disappearing"?