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Eventually, after failing to challenge the authenticity of Kieran's claims, the party could only shrug and accept what he said as the truth. After all, there were only two ways to see if his information was genuine. The party would need to find a way to experience Kieran's past experiences, or they'd have to wait for their next dungeon run to see whether this Insane Difficulty truly existed.
Even though there were rumors of a Lv.20 dungeon, there was something odd about it. Aside from the Normal Difficulty, the rest remained locked and unindicated. Even if players wished to, they couldn't glean information related to the greater difficulties.
At first, they believed it to be related to the fact the dungeon hadn't been cleared yet, but whether or not that was true remained unknown.
Sparsely edited.