That makes sense since it's Triumph offering the deal and not the dealer. If it were the dealer they'd offer anything in their shop not just the Triumph stuff.
Nancy works with car dealers all the time and when a manufacturer offer a deal like this the dealer gets it and then is reimbursed for it. Triumph isn't going to give the dealer money for something that they don't sell themselves.
But I would pay out of my own pocket for an AI kit.