AFAIK Ford and Turbosquid has made deal of exclusivity, so you can't sell digital models of Ford production anywhere but on TS. Most likelythat is the reason why your model was removed. Although CGT usually informs seller about removed models through e-mail. Maybe they just forget to do so this time, or e-mail has got into your spam folder.
Anyway, there is a short list of brands that are not allowed to publish on CGT. You can ask about that list at CGT support or shoot me PM if you want. That could save you some trouble if you pick "wrong" brand for your next model.