I'm afraid this "tech" ranks right down there with most of the Chevy techs I've encountered.
One headlight on my new truck was pointing at the moon. The "tech" cranked the elevation screw and it came down maybe 20*. Still pointing at the sky, he said that was the best he could do. I turned off the headlights, popped off the rubber boot, checked the bulb and it wasn't seated in the mount. I turned the bulb, it popped into the mount and I put the clip and rubber boot back on. I turned on the headlight which was now pointing at his shoes and asked him to align it properly.
Pretty sad what passes for a "tech" for the last 15 yrs or so. I would hate to see him try and diagnose a real problem.