This sounds like the pattern
The reason for the parentheses may be because of the directions for Row 5 and all odd rows
"...work (yo, k2tog) above previous (k2tog, yo) patts on next RS row, then (k2tog, yo) above previous (yo, k2tog) on next RS row to stagger eyelets..."
It's just to set off the k2tog yo steps that you will have to pay attention to on the odd rows in order to get the staggered eyelets. There's a complaint
about the pattern over on Ravelry but I think it's someone who missed the (k2tog yo) alternating with (yo k2tog) on RS rows.