Full patch notes are here

[Zakalwe]

I doubt that. According to the notes, the three new dungeons are also part of a Duty Roulette Extreme, which would be harder than Haukke HM, Sirius, Copperbell HM. I doubt you would have to get into these "extreme" dungeons just to get darklight. But, I could be wrong.

You are right that it makes no sense, but that is my recollection. Hope I'm wrong.