> the department head would remain bound by the Presidential interpretation until the President relented
I don't know what you mean by "bound"?
The President, EOs and the exective branch are not immune from court decisions.
If a court rules again an EO, the President would need to abide by that court decision. As per this EO, the department head would do what the President wanted (align to the court order), and would thus be in compliance with the court order.
In the case the President decides to ignore the court order, the department head has an option - do what the President says or do what the court says. If they decided to do what the President says they would also be in violation of the court order. If they did what the court said, they would likely be fired.
It's not like this EO really changes the situation? Before this EO a department head would have the same choices and face the same risk of being fired.
> Sec. 7 is so ridiculous on its face that, while I am sure the Administration seriously does want to impose as much of this control as it can get away with
I'm not sure what you mean? Why is it ridiculous that an agency which derives it's authority from the executive be able to ignore the head of the executive's interpretation of the law? Who would they be accountable to if not the US President? Nobody?
There are no "independent agencies" under the US Constitution. All agencies exist under the purview of the President. What Section 7 says is "no executive agency employee may make an independent interpretation of a law outside that determined by the head of the executive".
This is entirely aligned with prior US Supreme Court decisions that the US President has sole authority over the Executive Branch.
I'm not sure we'd want to have an unelected executive agencies that is unaccountable to head of the executive branch. That just wouldn't even make sense.