This really does not follow. We already have plenty of exceptions for what is appropriate when reporting on public versus private figures in other aspects of life. As Musk himself has demonstrated, "absolutism" of any sort is a difficult view to hold when one's feet are put to the fire, and nuance is actually important.
Even if you think that reporting on Elon's plane (or in the case here, the "reporting on the reporting" on Elon's plane) should be forbidden, I would suggest that this development is still difficult to defend. This is a reversal in policy that Elon made because it was about him personally.
Are you sure Elon will continue to agree with you on who/what to censor in the future?