Why should it matter, said officer shouldn't be querying NCIC to dox his neighbor. I doubt he actually bothered to use the local parcel viewer.

It matters because to make the inference that he was connected to the police and misused police resources to find her information, that information has to not be readily available to the general public.

If she had been an owner, the information would be available to the public, and not even all that odd for a neighbor to look up (I look up sales records for houses that sell in my neighborhood to see what they sold for, for example, to get an idea of how the market is).

In this case, Renter. Just moved. License would still have old address. You couldn't have "accidentally" found someone like that.