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Any "nut job activists" can go straight to the same source @elonjets used; https://globe.adsbexchange.com/?icao=a835af.

This information is absolutely trivial to find and monitor.

Only if you know about it. How many people actually know about it?

We're talking about stalkers, right? People who have a vested interest in finding such a thing?

How many people knew about @elonjet? You have to seek that out, too.

You can get the information in three search queries.

"How can I track someone's plane?

"What is Elon's plane registration number?"

"Website that tracks plane flights by registration numbers"

There's non-zero number of people who are not able to enter these three queries in google, and may have desire to act on that information.