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In most vehicles, airbag wiring is quite separate from other controls and just requires power to trigger. No CAN buses or higher levels of abstraction are involved.

In this case, I expect the air bag module plugs straight in to the existing connector, even if the other controls on the wheel don't. It may even be the same airbag model between the yoke and the wheel.

There are regulations which state how airbags must function. There isn’t much leeway to interpretation. This is generally why you can swap steering wheels in any car so long as the wiring matches up.

The leeway exists in the airbag controller, that can decide when to deploy, how it deploys (3 stage vs 50 stage) and what and how much data to store in nvram.

It’s all open on DOTs website if you are so inclined to look

Source: wanted to swap in new seats to my car from a different model. Found the side airbags were plug and play when you fabricate your own connector

If there’s a problem with the airbag, the ECU will likely throw a code.