^
I would assume autopilot takes care of the aircraft pitch itself, so it wouldn't need MCAS. "Manual mode" is not taking it out of autopilot in this case, it is overriding the MCAS system. They are 2 separate "auto" settings, where MCAS 's only job is to prevent runaway pitch. Autopilot is much more than that.
That's how I understand it, anyway.
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