Wait are you serious? He absolutely has access to it and even if he doesn't he employees the personnel that do. Additionally, he has already been caught twice shutting it off to prevent attacks on Russia.
What actually happened was that service in that cell had always been off and SpaceX refused to turn it on as doing so specifically for an attack would (obviously) make them party to that attack. It would also not be in line with US policy as they too had, until recently, refused to provide guided weapons with the kind of range that such an attack would've had.
https://www.engadget.com/ukrainian-official-claims-elon-musk...
Similarly, the reporting about the first time was misleading too, as the 1300 terminals that CNN reported on were ones supplied and paid for by the UK, which Ukraine and UK had agreed to stop paying for (because there were ~22k other terminals directly supported by SpaceX) and Ukraine had replaced them with other functional terminals before their service ended.