Civilian trial for on-base sex offense in New Zealand

A case of on-base sexual assault of one member of the service by another was just tried in civilian court in New Zealand. Details here. Such a case would certainly be tried by court-martial in the United States, and would have been even before the country switched back to a service-status subject matter jurisdictional rule in Solorio v. United States. Perhaps some knowledgeable reader in New Zealand can shed some light on why this case was tried in civilian court. [Real names only, please.]