There is no way this is translated correctly. I was already in doubt from the previous 3 chapters but this one just confirms that what is posted is a bunch of nonsense.
The way I thought about it is that the Netherworld is really vast as previously shown when the 13 Crowns Dinner happened and Iruma was asked the question of how he would change the Netherworld. So there might be demons that really haven't seen a lot of the stuff in the museums. Similar to how...