For the record I was denied access to the lounge in the evening last week while staying in a paid grand deluxe corner room (which includes lounge access), on account of it being full. The solution offered was to take drinks back to the room, and await a call when space would become available. That call never came.
I would tend to agree the hotel is justified in cutting back on non-top elite lounge access if said elites are preventing paid club-level customers from entering it.