Animal farm wasn’t specifically about communism, though. The lesson was that any well meaning revolution/societal restructuring will inevitably get hijacked by a smaller group that wants to use it as an opportunity to grab power and seize control. No matter what said group calls themselves, they’re most likely going to end up as the same aristocracy/oligarchy that the revolution fought against.
It’s exactly what happened in the Soviet Union but it’s also potentially what could happen in any other revolution.