S1 k1 psso (aka skp) is structurally identical to the SSK, and so mirrors k2tog well. Will these decreases be visible on the finished piece? If the will be covered by, say, a turtle-neck collar or similar, it might not matter if they don't match. But if visible, I'd definitely use SSK/SKP instead.
It could be that the designer doesn't care, or that she finds the k2tog tbl preferable because of her personal tension (some people can find that their SSK is enlarged, and the twisted stitches when knitting tbl give a tighter result).
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