They are Alpine in the sense that FCA paid Alpine to use the name on the system, that's it. Most products are contract manufactured and only the brand that they are, because that is the box they are contracted to put it in.
That's how Ryobi today, is as big as they are. TTI were the contract manufacturers for the Japanese Ryobi, and then they bought the rights to use the name for the North American market, and then bought Milwaukee, but are still the contract manufacture for Ridgid tools in Home Depot.