mothballed parent
Yes, exactly, the executive can ignore the court's interpretation, including an incorrect interpretation of impeachment (perhaps interpreted in such a way that impeachment as you know it would be impossible), if it violates the constitution.
The executive cannot ignore the court's interpretation on their own.
Christ, are you in high school? This shit is covered in like sophomore year social studies.
OK so the court can then simply declare an "interpretation" of impeachment that makes it impossible, or meaningless then, or perhaps also interprets any such jailing by the executive as illegal. Since they are the ones that get to decide what the text written in the constitution actually is interpreted to mean and apparently their "interpretation" cannot be ignored.
The court can say whatever they want, but they'd be saying it from jail.