I should have worded it better. More accurately it'd be certain third party cables no longer work. Only cables certified by apple will function. I can say this with absolute certainty because of my own past experience with it.

Thank you for also answering my question in the second part.

I remember when I thought my old ipad was broken because it wasnt charging. Took it to an apple center and they told me I just needed an apple made charger because third party chargers no longer work. They have the technology to force people to use their branded chargers, so is there anything stopping them from doing the same with usb c?