Sl 2 wyif

It’s from this pattern…

http://www.knittingknonsense.com/DW_cloth.html

Cast on 38 stitches
Rows 1-4: Knit across
Row 5: k3, p32, k3
Row 6: k6, *sl 2 wyif, k2; rep from * to last 4 sts; k4
Row 7: k3, p32, k3
Row 8: k4, *sl 2 wyif, k2; rep from * to last 6 sts; sl 2 wyif, k4
Row 9: k3, p32, k3
Row 10-57: repeat rows 6-9 twelve (12) more times
Row 58-60: knit across

would that be slip as if to knit, or slip as if to purl since the yarn is in already front?

I always slip as if to purl unless instructed to do otherwise. Slipping as if to knit twists the stitch, and you don’t always want that.