That exhibit was demolished a couple decades ago. No mention of such beastial practices now on Smithsonian property. The new Native American museum is hardly worthy of being called a museum: it's more of a shrine. Of course.
Indeed, I say this as a Native American myself who is appalled at how much of our history has been dropped into a "memory hole" in just the last generation or so. Some tribes were actually more civilized than our white counterparts, but not all of them were. The Aztecs were one of the worst even though they had the trappings of civilization like great public works.
Did you ever read George Orwell's epic novel 1984? I say we are living it now, even more than we are Atlas Shrugged.