That piano-playing cat is fantastic!
If that isn't a sign of intelligence and music-loving aesthetics, I don't know what is!
But, while the cat is playing the piano so beautifully, she is not out hunting and catching small rodents and reptiles. Nor is she mating with other cats to forward her species.
She's just playing the piano while humans watch her.
If I crawled around on the ground hunting mice to impress cats, would I be considered very intelligent?
Our minds have developed to excel in the niche into which we have evolved from our biological pasts. And to say that a human mind is "superior" to an animal's is to delete or change the correct context for the question, and to apply false standards to those minds.
Hubbard was simply, oversimply, appealing to anthropomorphic urges to make a sale.
The statement is completely out of proper context, without consideration for the proper standards, and totally unanswerable.
Very poopy.