Comments of chapter undefined of Dungeon of Pride, Laplace

Isn't the grey haired masked man dismissing the ruins a bit too fast ? Just because the monsters were low-leveled doesn't mean that their potential is also low level. He said so himself. Actually from the records of those that survived he should know that the monsters weren't that strong against those geniuses. That begs the question : Why were they used then ? As he said they might be a new or just unknown species. Did it really not go through his head that those geniuses were just a test for those monsters ?