They're not going to enforce anything right now, but things are still up in the air, and they may in the future. By warning now, they can get the word out to p

They're not going to enforce anything right now, but things are still up in the air, and they may in the future. By warning now, they can get the word out to people who start (following the election victory) lighting up in public, that "you might want to be careful about that, and here's why." So if they do decide to get more harsh on public use in the future, the the public will be more prepared, and there'll be less of a mess due to a sudden shift in enforcement. It seems pretty clever, and good policy.