This argument has been made on plenty of forums, with the crux being that because he experienced time simultaneously, he is unable to change any of it. But there has never been anything to suggest that he lacks self determination, just that he is inbound by the linear concept of time. If it was established that he had grown weary of his existence, or his experience of love with Angela Abar was contingent on his death, then there would be some sense. Neither of these things appear to be true or are implied.
Angela could have easily attempted to save him, and he still could’ve saved himself. Tbh they tried far too hard to be clever and in the process destroyed the entire point of his character, which underpins this universe. Even if the moment is past, present and future to DrM at all times, in the determination of the action he still could’ve teleported the entire 7K to Jupiter. They tried to create this sense of inevitability about it, but it made no sense.