You got kicked by one of the various kicker/hosting tools out there ... they can change the message to say whatever they want when they kick people.
You were not banned from VAC, therefore supporting my comments that this is still currently undetected ...
That said, supposedly better VAC integration is coming in the next patch which we get next week, so time will only tell if they have wised up and learned how to actually police their game. I doubt anything will be changed and it is yet another ploy to get people to buy dlc maps like they did with dlc2 collection and nothing changed.