[fuzxi]

The article does say that those costs aren't included in the maintenance total.

But considering that they replaced the entire windshield (and sunroof glass) for what they describe as a stone chip, I'm inclined to believe they may have been overpaying or overdoing maintenance anyways. AAA suggests the price to repair a windshield chip would be around $100, and that replacement isn't necessary if it's smaller than a quarter.