I've watched some of his videos. He is conversive in them. Which reaches far beyond basic mimicry and bare memorization. There are people who study a language for years and fail to accomplish what he does in weeks or months. I suppose you could claim it's entirely rigged and everyone is in on it. But there really are polyglots like this. I personally am in amazement of that talent. Maybe foreign languages come easier to you than me? I don't believe I could pull off what you suggest.