Actually I’m this case I think he means combustion chambers...
No. I think they're referring to Tesla (and its struggles) seeing that it's a car company and cars classically run on cylinders, but since Tesla's are electric, no cylinders. You know since Elon Musk is a founding member of both SpaceX and Tesla.
I thought they were referring to SpaceX as well seeing as it's 3 cylinders and the topic at hand.