Yeah... it's not uncommon for cats to dislike the pre-digested meat canned foods. I have to feed one of my cats dry food, because there's not many good pet food companies out there that manufacture meat chunk canned food, but I pour water into her kibble so it's easier for her to eat.
Who knows what Royal Canin's idea behind it was, :/ They used no scientific research behind it, it was just, "Hey, Maine Coons are large! Let's do this!

"
It's like companies who manufacture "duck-flavored" foods as "Allergen" free. The only reason they're "allergen sensitive" is because it's not a common protein source used in cat or dog foods. The only reason it's good for cats with allergies, is because it's a different meat protein, period. The same protein = allergies for many cats.
But...such is the world of the pet food industry. Full of lies and scandal, :/
....It IS pre-digested meat, though. Lol. It looks like some other animal chewed up the meat, regurgitated it, and the pet food company plopped it into a can, x_X