If DACA had an expiration date, that in and of itself is “notification”. My drivers license has an expiration date. On that date it is no longer valid. Nothing needs to be done to ensure it is no longer in effect.
But I’m operating on the assumption that DACA had an expiration date. Maybe it didn’t.
I don’t remember the particular federal statute that the District Court relied upon, but it had something to do with there being a notice requirement and waiting period to stop various benefit programs - regardless of the merits, legally or otherwise. This would not apply, of course, if a final court ruling said, “It is unconstitutional.”
I’m expecting the latter in about a year. It sucks to wait, but we didn’t elect Trump to wipe his rear with the Constitution, like Obama did repeatedly.
Your driver's license parallel is a good one. DACA immunity has an expiration date, and must be renewed to stay in effect. The lower court order that renewal applciations must be entertained, but the is no bar to not granting new/additional DACA status.