This really doesn't mean a damn thing. I've competed in one meet. Well over half the awards given out, probably closer to 3/4, were first place. With amount of gear, age, gender, perhaps tested and untested, single lift competitions (bench and/or dead only), and weight all creating different ways to classify lifters, there becomes a ridiculous amount of categories you could win. I myself took home second place (yes I was one of the few they couldn't find a category for me to win) in the amateur, 19-and-under, raw, 100kg division.
EDIT: This is not to say the information you were given is wrong, or that your cousin is not strong, simply that placing in a given powerlifting meet should be taken with a grain of salt.