That not every plane used by musk technically applied, or is able to apply, for a PIA kinda misses the main point. Sweeney )the jet tracker) has proudly claimed himself that he has cracked the PIA and will continue to post musk's location to matter anyone's privacy wishes.
https://www.globalair.com/articles/pia-privacy-program-no-ma...
You can't "well akshually," out of the privacy concern here.