Itchboy's work represents what you will likely see in the LAPD fleet. Crown Vics, Ford Interceptor Sedans and older model SUVs. Same goes for the Chargers and Tahoes, as well.
Your analysis of the mod and its purpose/idea is correct. The project is intended to represent the most likely vehicles to be seen in LA. It does not exist to replicate every single vehicle that putters around the city. If it were, then there would never be a release due to the constant change in vehicles and fleets.
They may have 2016 units, but it wont be feasable making the vehicle unless more than half of their SUV fleet is composed of that. The 2013's are majority now, so they are going to stay put. I will add or change vehicles as I deem fit.
There won't be much else posted here until the next version of Montana mod is released.