Earlier quoted context omitted.
They aren't. They are informing the President and the President does it either by EO or asking congress.
The president can't decide to stop spending money Congress has passed by EO.
Now I do not know if Congress has explicitly required X to provide certain thing. If they did then there might be some issue if X fails to provide it. It's probably easy to say someone is accountable for it if it's something objective (let's say building for Congress) but if it's subjective it could get tricky.