That's extremely odd, especially in just one cylinder. Also some techs may just lie about doing x thing to not actually waste the time doing it but give a whatever expensive answer they think they can get away with. Believing a cylinder is scored after it having low compression is something I'd assume too. Definitely have it inspected again, I'd do it myself since i have my own snake cam. They're cheap these days you can buy one and pull the plugs yourself. A scored bore would burn more oil than the rest. The spark plug would show it. I'd also do a leak down test.