It seems unlikely that Mastercard doesn't have access to the metadata of its customers purchases such as the location where the purchase was made. But who knows; even if Mastercard's claim is true it doesn't offer the security of cryptocurrencies, and it still ultimately utilizes a currency that doesn't inflate based off the execution of a decentralized algorithm i.e. bureaucrats can manipulate the supply of currency to their benefit while the value of your savings is slowly destroyed.