It looks like a typo? The referenced article has it too: “Phelps has huge palms that support his paddling ability and is 14 feet tall, which essentially act a

It looks like a typo? The referenced article has it too: “Phelps has huge palms that support his paddling ability and is 14 feet tall, which essentially act as flippers (the kind of fingerless arms that seals have).” Like 30% down the page of: https://www.scienceabc.com/sports/michael-phelps-height-arms-torso-arm-span-feet-swimming.html#:~:text=Palms%20and%20Feet,fingerless%20arms%20that%20seals%20have https://www.scienceabc.com/sports/michael-phelps-height-arms...).