It was communist in the sense that it was commanded by a communist party and was oriented towards communism (some would say socialist-oriented rather than socialist), but it had not achieved “communism”, and was squarely in the socialist camp with the proletarian monopoly on capital (USSR literally means United Socialist Workers Republics). I would have no issue with you stating the USSR was communist in the same way Vietnam could be called socialist (in goal and in guidance), but stating that “communism isn’t the solution long term” makes no sense. Do you understand the distinction?