You yourself have no idea what Marxism is because one of the basic tenets of Marxism is that productive forces shape the society. The people opposing AI want to stop the very thing that can help change society.
You can't just will a society to gain consciousness - it has to come from the productive forces. That is materialism.
>one of the basic tenets of Marxism is that productive forces shape the society
Correct. So a future where AI does the majority of work means that the proletariat is no longer the historical subject; AI and its ownership class are. In this situation, AI will shape the society, not the workers. Not really a desirable outcome for anyone engaged in mass class politics.