There are two lists. One is for countries that have been at some point and the other is countries with a socialist/communist ruling recently or nowadays.

In Portugal a socialist-communist government is governing right now. It is not like they do what their supposed ideology says, but it is a fact that the government is that. Mexico is now managed by Lopez Obrador, a socialist. Argentina by Alberto Fernández. Another socialist. I agree those countries are nothing near Russia before, but it is the governments they have now.