It goes from 11 sts rem to -- Bind off rem sts, dec 1 st at each edge as above. That was why I was so confused!
Well it was confusing to me too. Usually you don't dec the last few rows on a sleeve cap, just BO on 2 rows or something.
Okay I found it on Ravelry, and maybe it's a typo leftover from the girl's sweater where you would BO, but on the doll sweater you just dec. That's what the pictures look like. If the front and back armhole shaping just had decs and no 'work straight until X inches' instruction then you match the shaping on the sleeves.