The customer felt cheated because he bought an early version of a product with fewer features that cost more money. Jobs was having none of that argument, stating that the customer was not cheated because he got what he paid for when he paid for it.
There was no promise to support future developments to the buyer of the earlier product. No features were taken away. It did x, y and z when the customer bought it and it still does x, y, and z today. The customer may wish that it now does a and b, but it doesn't. It does today exactly what it did when he bought it.