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Maybe it's like the free cargo net. Many times people don't choose the option but end up with it anyway, by default. I'm guessing it's the same with voice control.
That said - yes it's an option that is selectable on their configurator.
Guess its different in Canada. There is no stand alone option on the configurator for it and it shows up in the "Standard Equipment" list.
As others have posted and I suspect, voice control isn't likely to be a much used option in a noisy environment. I'd most likely use it for dealing a number which is pretty easy to call up using iPhone' Siri through Apple Car Play.