In the final analysis, Obama didn’t really change the law, ‘cause, like he said, he can’t do that. He just ‘took action’ to change the law...
Big difference! (somewhere...)
It is one thing to not enforce the law but to change it’s meaning and reach is changing it - can what he has done be undone? If not then he really has changed the law. If it can then Republicans could re-prioritize if they ever get elected and deport all those illegally in your country - not that I believe they would for one minute.