No, Marx was caught in a time dysfunction. Once Marx brought trans people into reality, all history became warped to reflect that trans people were always here.
To understand this, watch S03E08 of Twin Peaks. It's the best summary of this idea.
Many millions. It demonstrates how any idea can be used to serve evil. Marx had important ideas, but all philosophers had an incomplete view. They aren't gospel or an unquestionable authority.
I honestly view him as similar to Jesus. They had mostly good ideas and important messages, but their ideas got co-opted to serve empires. Stalinists today talk about the writings of Lenin and Marx like Christians referencing scripture. The identities overtake the teachings, creating terrible cults.
However, that doesn't make the movements universally evil or unprincipled. Liberation theologians and communists have fought side by side against authoritarians. It's important to understand the nuance and learn from past horrors.