> decided that their main goal is finding arbitrary noncitizens to deport

In the vast majority of cases this means: "enforcing immigration law." A presidential administration deeming it politically expedient to import illegal immigrants via turning a blind eye doesn't change the law of the land.

> that they're entitled to the ALPR data collected by municipalities in order to accomplish this goal

"Entitled" to purchase something that is being sold on the market for a fair price? Why wouldn't they be entitled to purchase this info if a vendor wishes to sell it to them?