This person doesn’t know how to search for things on the Internet. https://en.wikipedia.org/wiki/List_of_anarchist_communities You should know that for 95% of huiman existence almost all tribes where anarchist. There is a good youtube channel “What is politics?” that talks about this.
He’s wrong about “a few days”, but that article does not support your case that anarchism works
It supports the case that it can work. I never made an argument that it always works forever. There are failed attempts, but the cause of their failure is also very important. It is often claimed that somehow, internally, anarchism can not work within a country, while usually the reason anarchisam is destroyed is due to outside invasion or interference. It is simply the case, that anarchist are currently outnumbered, mostly due to opinions like this, that it can not work, so we should try it. If we get a critical mass of enough people, it would be the opposite, states would not be able to survive in a majority anarchistic World, as no one would need to surrender themselves to domination by rulers if they can easily find a better alternative.
