Do I think it boosted their sales, nope. Do I think it was intentional, nope. But, Just wanted to point out if you look at it a complete vacuum. It was widely successful because years later and you are still taking about it.
It was successful IF their intention was to be openly mocked nationwide, be forced to close their store for days after it aired, hire and train new employees (though I think the owner's daughter who made the commercial still works there), and likely led to a drop in sales.
However you define it, that isn't "successful" in business terms. Notorious maybe. Not the same thing, at all.