Yes, the pattern not really clear but the raglan shaping should be on the knit, RS rows. The WS rows are purl all the sts.
For the 6th size the instuction becomes:
Dec 1 st as set at each end of next and every foll alt row to 23 (23:23:23:25:25:25:25) sts.
Work 1 row with RS facing for next row.
So yes, ignore the instuctions where you have a 0 for your size.