He was probably referring to a radial tire "pull". It's not uncommon, even with new tires. It simply means that one tire has significantly more rolling resistance than the others, resulting in a pull, or drift. The tech most likely had to spend some time moving the tires around to get the car to track properly and they wanted to charge you for the time he spent on it. At least the tech was conscientious enough to make sure he got it right.