Yeah I mean no culture is absolutely 'primitive' but if we mean by that that they were technologically less advanced that the Romans then that goes without saying, pants notwithstanding.

Also (obvs not targeting you herecomrade): Marxism is an Modernist philosophy which is partly and expression proletarian Enlightenment. The notion of progress and civilizational development, indeed of the human species as a whole taking control of itself and its future in a democratic and radically efficient way is baked into the basic ideas of socialism and communism, since inception. If people don't use the words this way they are not talking about the same things. People don't get to have their cake and eat it by both championing the progressive achievements of the USSR, which were specifically modernist ones of economic, scientific, technological and sociological development, as well as the pioneering of the development of central planning, and then say we can't make comparisons.