If you notice, it says that changelings can eat "other strong emotions." Love isn't the only thing they can eat, it seems.

This is from the official card game.

Who cares? The comics tear cannon to shreds to the point where the fans who care about cannon work it out themselves. It's already a logical view that they'd feed on any type of emotion, but they prefer love due to the taste. This being printed on the card only means that Hasbro is looking around the fandom or came to the same conclusion thousands of others have a few days after we saw the changelings for the first time.

4325892 I like that it's a Loyalty card.