I appreciate the point you are making. MVP’s need to have the essence the product you actually want to build, otherwise all the validation and learning will be useless.
But you’re taking the diagram too literally. The Skateboard > Scooter > Bike > Motorcycle > Car analogy means that your MVP and each subsequent improvement after that needs to result in a usable, useful, enjoyable product in its own right.
I don’t think anyone is actually suggesting an aspiring car company would benefit from building a skateboard as their MVP.