From The Daily Mail: 

YouTube user Grace Shah said: 'Zoologist here. That condition doesn't cause any noticeable symptoms, especially that of a human-like meow, and a cat's voicebox is pretty incapable of making a noise like that no matter what happens to it anyway. The video is obviously a funny joke.' 

But Sofia Garcia retorted: 'I don't care if this is real or fake, it's freaking hilarious either way. Please don't fight about this, it doesn't really matter.' 

If Jack does have a genuinely deep voice, he will have one thing to be happier about.

A deeper voice improves chances of finding a mate, university researchers found.

Studies show lower voices in males are found to be more attractive to women.