The plan on the LRT is a little outdated now I think. But of course there is no impetus to change, since there are costs involved, and plans now may be changed later. dafansu is probably more correct at this point, since the latest brochure of Damai Grove launched yesterday indicated that the CC is beside Punggol Plaza, not along Punggol Central.
Anyway, these are just projected plans. Until the piling starts, anything can change. After all, if they can build a river (or waterway) in Punggol, they can do anything, let alone a CC.