He's right. Outside boxing fans, no one in Europe -- outside the UK -- really knows about Floyd Mayweather. Even less know about Canelo.
The average man wouldn't be able to pick Mayweather from a line of Kevin Durant, Ray Lewis and Dwyane Wade. I would dare say Andre Ward is more famous in Europe than Floyd due to the Super Six and his wipeouts of a Brit, Dane and German-based fighter.
With that said, they do broadcast Mayweather's fights in Denmark on free tv, which the sports networks cop for a penny on the dollar. He's very well known in the UK, though.