What is the real motive behind criticizing Elon Musk's involvement in government scrutiny?

According to James Freeman, while Musk is portrayed by some as a 'helpful villain,' the criticism is actually aimed at undermining Trump's legitimacy. Freeman observes this is part of a recurring pattern where Trump's opponents try to cast his presidency as illegitimate after he gets elected. Freeman emphasizes that regardless of these attacks, Trump has been properly vested with executive authority under the Constitution. This suggests the criticism of Musk's involvement in government spending scrutiny is less about Musk himself and more about delegitimizing Trump's administration and its efforts to examine government expenditures.