That's not quite right:
"The President of the United States will be given access to any government or military information that they request, even if they would not otherwise be able to normally obtain a security clearance were they not the President."
https://en.wikipedia.org/wiki/United_States_security_clearan...
Trump essentially granted Musk his presidential clearance. If Musk hits any resistance to classified information, Trump can just access it and hand it to Musk. If it's a crime to do so, Trump can declassify it, pardon Musk, or just instruct his DOJ not to charge him.