What role does Elon Musk play in narratives about government legitimacy?

According to James Freeman, Elon Musk serves as 'a helpful villain' for some in a broader effort to attack Trump's legitimacy. Freeman suggests this is part of a recurring pattern where Trump's opponents attempt to cast his presidency as illegitimate whenever he comes to town after being elected president. This narrative strategy aims to undermine Trump's authority despite the fact that as president, he has been constitutionally vested with executive authority. The focus on Musk appears to be part of a larger political effort rather than a substantive policy criticism.