Sure, but I'm not sure what conclusion that helps us draw in regards to a contractor/employee distinction.

The former is saying a business cannot exist without employees performing critical functions (I'm not saying that this is de facto truth, but just phrasing the argument).

The latter is saying that without a business, you don't have employees/contractors, which makes sense, but seems obvious and inconsequential.

I think it's more like "You can't have one without the other, therefore they aren't just contractors".

A ride-sharer / driver needs the platform and the platform needs the driver, fundamentally. It's not like most contracting where it's not the end of the world if all the contracts end.