I've been wondering that too, sounds like he's developed polyps in his throat, ala an overworked vocalist. But, that doesn't help us answer the "why," and neither does the fact that he's been dieting and has lost a lot of weight the past few years. I hope he hasn't been eating then sticking his finger down his throat to upchuck the meal. That'll certainly do a number on the throat over time...
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them