Hold on, their moderation methods are as transparent as could possibly be. Every article has a dedicated page where every decision has a reason and more often than not an overwhelming amount of discussion. Their overall policy is similarly debated publicly.
Is it overwhelming? Oh yes. Tough to change? Probably also yes without dedication and sound reasoning. But opaque? Certainly doesn't fail that criteria.
It certainly becomes opaque when it is a labyrinth of links and documents that you need to read and follow through. It does not help when these same rules can be abused to death by veteran users.
At a certain point, no one really knows the devil's dance happening at the top of the moderation ladder and you end up wasting a lot of lifetime on these dead talk pages.
It is a bureaucratic nightmare.