I used to see a lot of this back a year or two ago. I attribute it to the continued ambiguity across all fields that touch UX design. It's not wrong, just interesting. Just to clarify, I see interaction design as one of the 5-6 main disciplines that make up a proper UX Design objective approach. BTW - HCI is so often enigmatic, even in the biggest schools(Stanford comes to mind), that it's simply fascinating to look at their curriculums.