It does not matter what standing Musk has, the question is the important part, not the asker. You can accuse him of hipocrisy and that still makes no difference. He can still be the vehicle for the question to be asked.
The role of the government is to make the laws, and to apply them when violation are reported. It is also to regulate new situations as they arise, for example, if a court decides the law allows a non-profit to become a for-profit and that is deemed as not desirable, new laws can be passed to amend that.
It is the government roles, however, to going around to aks hypothetical questions before they are risen by someone, as there are too many possible hypotheticals, most never materialize, and that would be a conflict of interest. In that case Musk is as good as a vehicle as anyone else because he is bringing to the court a real-life problem that needs to be decided.
The Trump admin is not fond of enforcing regulations as the Biden admin was not fond of enforcing other regulations. That shows you can't expect the govenment to take that role since it's discretionary.
