I think it's another case of one shop on multiple floors.   I added the unit numbers from the original planning application for the whole mall.   So in the indoor schema, it's two rooms, each with a different unit number on a different level.   BUT only one "shop" amenity.   So I guess it should have the same treatment as Primark next door?  (Incidentally, the official Westfield map also counts it as two shops.)    I'll have a look at it this evening and let you know whether the two levels have their own independent vertical transport.   (Primark and a lot of the multilevel shops have their own escalators)