It’s a rhetorical question. If you can jump like this cat jumps, why would you need to fly? And I get a strong impress that he does it for the joy of it.
Our cat Buster used to celebrate a successful visit to the litter box by jumping as high as he could and bouncing off the wall. Eat your heart out, human.
That’s quite a house, quite a song, and quite a cat. You have to respect such agility.