Yes, it does. Because it draws a clear line in the sand. The administration can choose to disobey the order, but that opens up individuals in the govt to potential prosecution later. That's why governments try fairly hard to go the legal route or at least maintain a fig leaf of explanations, however implausible.

The supreme court might have declared the president to be immune for official acts, but that doesn't extend to govt officials blatantly choosing contempt of court. They have practical immunity in the current administration. A future administration might not look so kindly on such actions.