I really don't think he is that clean, but he is dirty in such a way that there is no possible way they can hit him without taking down someone else in power who is untouchable.

But that's just the incredulity of someone, like you said, not doing Wolf of Wallstreet shit at his level.

So it leaves the two possibilities of him genuinely being a clean enough guy, or their own masters are just as stained as him and they can do nothing about it.