Don't get too excited, the argument here is basically "you need more signage, to make sure people are aware of the law they're violating, before you can arrest them for it." Like, it's nice to hear a judge actually considering and following the law But this doesn't really invalidate the administration's end-run around the laws on who they can and can't deport. If anything, it gives them a better roadmap for implementing it.
On the other hand, when we talk about people within the system leveraging beauracracy for resistance, "nah, you need to build more signage first" does kinda fit that model.