I don't know why there would be a neutral. Three phase to the DC inverter would not require a neutral.
The chargers are wired line-to-neutral. 12 charging units in a V2 Supercharger cabinet, wired in four groups of three, with each charger being wired line-to-neutral for an equal load on phases A, B and C on each of the groups.
I don't know how V3 are setup yet, but I'm sure they'll also require neutral for one reason or another.