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That's assuming no one makes any mistakes, of course.

In most deals both parties profit as they are not zero-sum games. You give me money, I give you a loaf of bread. But in the present case the deal appears to be zero-sum: Either Tesla saves money, or the customer, but not both.

Although in general there’s a pretty big information asymmetry between a multi billion dollar car company and a boomer dad w/ a Tesla. So whether the latter is usually better off may be debatable.

The multi billion dollar company has more information and resources, but also has the disadvantage that it has to make uniform offers to large groups of people.

The same offer might be hugely in favor of one customer and to the disadvantage of another. Who's favored overall depends on who accepts the deal (which both sides can try to influence)