StatusMatch means that when a person has a high status (gold, platinum,...) by an airline/hotel/car rental/... Another company will match your level, in other words, give you an equivalent status by them, although, you technically didn't deserve it (meaning, you didn't fly/stay/rent enough to earn this status).
Companies do statusmatch as an incentive to start using them (instead), so it typically will only be offered by competing companies.