You just haven't thought the logic through the end conclusion. PoW mining only works as decentralized consensus insofar as a majority of miners are normal honest people. When specific hardware has an advantage, the mining pool centralizes there creating a situation where whoever controls that hardware controls the consensus.

What you've done in your argument is extrapolate the egalitarian principles of RandomX mining into being equivalent to communism. Then you used the specific real-world instance of communist society, Cuba, to conclude that RandomX is bad. This logic is a non-sequitur, it doesn't follow.