Except it isn't. Elon's jet has been subscribed to this program for months:
https://www.faa.gov/air_traffic/technology/equipadsb/privacy
This was confirmed by Elon himself: https://twitter.com/elonmusk/status/1603803508087537665
So if Elon's aircraft identifier was meant to be publicly accessible even though he is using that program, why does this privacy program exist in the first place?