I know! Who knew?!?
I kept thinking my sweater pattern was just weird until I discovered the same instructions in my sock pattern and then checked ou Amy's basic decrease techniques to see what she had to say. Haven't watched the videos yet but I read what she wrote - it's labeled "SSK 'improved'". She writes: Lays slightly flatter than SSK. Some prefer it as an even closer match to k2tog. ...I can't make up my mind, I like them both!
I'm going to try it out and see what I think....