Why is it a security risk?
Don't the people who actually want to harm musk, and have the means to make it happen, have anyway the means to get the information they need to find him? If it's mildly obnoxious like having to look up land records, they'll just do that.
I genuinely don't see how posting the location of his plane is a "security risk." I don't understand why he gets this added layer of consideration as a person in the airport. They got security at the airport. He lands behind it, same as anyone. He comes through it and his security is in his hands and the hands of the local cops, same as anyone. What's the deal here?