Yes, you should knit 6 rows and then bind off. Think about it this way... when you cast on, you do not count that as a knit row, therefore, you do not count your bind off row as a knit row. I hope this helps and makes sense.
That's because the BO is a row, it's only different from another row in that the sts aren't left on the needle. You knit it the same as any other row. But do follow the pattern - if they'd wanted you to knit 5 rows and BO, that's what it would read.