July 2020:

There is no question that the Czech Republic’s remarkable progress on COVID-19 was the result of requiring an entire society to wear face masks.

Source: How Czech Republic beat COVID-19: Require everyone to wear face masks

February 2023:

The Czech Republic has the 9th highest mortality rate in the world due to Covid of 221 countries and territories ranked by mortality rate

Czechia was ground zero for the #MasksForAll meme that began in March of 2020, falsely claiming that simple homemade cloth masks worn by nearly everyone had stopped Covid from spreading. This was a model, the proponents said, for what everyone in the world needed to do to stop Covid.

It was 100% bull shit. Czechia ended up with one of the highest mortality rates in the world.

The Experts were wrong.