The Fed is designed to be independent from the whims of any individual politician, but it still exists due to an act of congress, and could be changed at any time by congress passing a law and the president signing it. And if that can't/doesn't happen, it's because _congress_ doesn't represent the people of the United States.
That is an extremely curious reading of the comment you are responding to, given that it appeared they were just arguing that if people want to change the Fed, and it doesn't happen, then that would show Congress doesn't represent the people of the US.
> if that can't/doesn't happen, it's because _congress_ doesn't represent the people of the United States.
You're just saying the same thing with different words. If the Fed or the congress doesn't represent the people it doesn't make any difference to the elite class, who indeed own these two entities.
The distinction is significant though, there mechanisms to limit the fed's power if it's necessary, even if those levers and dials are not being currently used.