And how could he have done it, being in Argentina in 1976? Not even asking about Vanguard. Just accessing s&p500 or NASDAQ is not easy even today, don't think it was much easier then.
The folks getting spooked about inflation right now and reading this thread (it is written in English after all), almost certainly can invest even very small amounts in high quality investment products. There's no need to get fatalistic about saving ("you get diluted into nanoparticles."), it has never been easier for normal people to put their money to work productively.
...and then the stock market gets stopped for a couple of weeks and exchange rate of international currencies becomes practically state-controlled.
> There's no need to get fatalistic about saving
There absolutely is a need, when the life just doesn't work like people here are pretending it does.
It's all just an extremely US-centric view, people there are just lucky to live in a fantastically economically stable environment, but this leads to them being unprepared to potential economic shocks, including not enough support for the discussions of ways to evade the consequences for regular citizens.