The thing that has changed is that 6 months ago, directing federal agents away from an illegal immigrant couldn't be rationalized by one's oath to the Constitution committing one to a belief like "I don't think anyone should be blackbagged and sent to foreign torture prisons for the rest of their lives without due process."
Sure, the law is the law, but it's certainly not true that nothing has changed.
Or to put it another way, if the enforcement of a law cause an action contrary to the USA Constitution then just as before a judge should block that action; previously - presumably - when applying this law it was being done constitutionally.
A judge aiding unidentified assailants (not bearing any insignia of office and hiding their identity) attempting to abduct a person and send them to a death camp would be supremely objectionable in any democracy.
Sure, the law is the law, but it's certainly not true that nothing has changed.