In how many of those states is that actually true? Maybe Cuba (which the US has been trying to overthrow for decades), and Kurdistan (oops guess who was completely abandoned by the US even though they were instrumental in defeating ISIS?), which that page doesn't even mention. The rest are some form of state capitalism. Certainly China is. Unless you think the workers democratically decided that being paid starvation wages to work in electronics factories to make cheap stuff for Americans was a good idea.
At some point in my early 20s, I mentally outgrew that childish, ill-considered ideology and I'm glad that I did. I've heard every argument under the sun for why Socialism will work if only you "put me in power" and I don't buy any of them.
Anyone arguing for it fundamentally does not understand human activity (behavior and history).