They may have been confused. If a golden comet laid the egg, the resulting chick will not be a golden comet even if it’s bred with a male golden comet. They are a “hybrid” bird created by crossing a pure RIR rooster and a pure white bred white hen with specific genes such as a Delaware or a Leghorn. Unless the person you got them from has heritage breeds and really know what he’s doing, they are probably not sex linked (aka golden comets, red stars, black stars). And you will be able to tell immediately by just asking what his rooster / hens are... if they are not pure RIR and White whatever , they are not golden comets or sex linked.