The big discussion point about this video is: is it real?! The more I see it the more I think the sound track has been edited. It would not be that hard to delete the sound of the meow and add the voice of a human making a deep meow-like sound.
I have researched the health aspects of deep feline voices! I must have been on a wild goose chase. Feline laryngitis causes hoarseness but not this extraordinary sound which is extraordinary it cannot be real. The video maker hints at the possibility of laryngeal paralysis. I have never heard of that feline illness.
The cat (whose name is Jack) looks old and thin. He may have a chronic illness such as hyperthyroidism but there are no chronic illnesses which affect a cat’s voice like this.
The title comes from a comment on YouTube which I liked and was chosen on the presumption that the cat is reasonably healthy and that the video has been created with sound editing.