Long Weekend Cardigan help?

Hi y’all!
I’m knitting the Long Weekend Cardigan by Yarnspirations, and something about the pattern has confused me. When working the back, in order to shape the shoulders, you have to cast off (x) stitches in the next (y) rows, but since Basket Rib has slip stitches, how would I bind off in pattern?

Thanks in advance!!!

You could knit the slip stitch on the bind off row. These sts are going to fall in the seam where you join fronts to back or where the collar meets the back neck.