1. The jet’s location is publicly available by law.
2. No one knows who’s in “Elons jet”.
If Elon wants to travel private without anyone knowing he is he can simply charter a jet. This is what most celebrities do.
My position is that I don't like his decision to ban this information, but I understand it. If, however, he is using this as an excuse to capriciously ban his enemies, that is something I don't like a lot more.
There's very good ways to guess who's in Elon's Jet.