That doesn't mean the cameras are good; I think they aren't, or rather, at least in my metro, I know they aren't.
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?
Flock will just start putting cameras up on private property and selling the data to the Federal government. Municipalities can do very little to stop this, and local governments are pretty poor at keeping their true reasons out of public forum deliberation. Loophole methods of prohibition ("Can't put up camera masts") are easily thwarted in court.