As someone who has not read Marx you can clarify - how does it matter who controls the technology? The industrial revolution was not controlled by labour, it still mattered.

Marxism fundamentally is: productive forces change the society, meaning the technology that exists at that point in time shapes the way people think.

Marx pretty clearly sees capitalist control of technology as a necessary stage in societal development. The capitalists are the ones who are incentivized to invent the technology, in order to bring down the cost of labor and outcompete each other.