I hope this is the last patch with more i60 dungeons.

[Felis]

But people were complaining Pharos Sirius was "too hard" and these new dungeons are supposed to be harder than that.

Harder than new Sirius, not than old Sirius.
For the hard mode dungeons, they want them to be at the same difficulty levels. They decided that the difficulty level from Haukke Manor HM fit it the best.