Memes

There’s no analysis of class dynamics

We do not think there was a struggle between capitalism and communism across the twentieth century. For us, communism never ended in that century because it never arose there. Our conclusion is built on the fact that communism –if understood as a distinct, non-capitalist class structure– was neither a significant, nor a sustained part of the history of any of the nations conventionally labeled communist.

emphasis mine, their entire argument is based on the fact that the USSR lacked the class dynamics of communism, thus weren't communist.