Yes, these agencies are all already executive branch, and exist for the benefit of the President, to make his job easier. They are not independent like the NYT is claiming, and they are not non-executive like Gato seems to think.

Trump is correctly illuminating how the executive bureaucracy has become an extra-Constitutional 4th branch of government, and a corrupt mire that is no longer serving the people through the single elected representative we have in the executive (the President being the unitary executive in the American system), and needs to be reigned back to the direct control of the duly elected representative, or killed off if it refuses to be reigned back in.

This is correct Constitutionally, and he's recommending a decrease in size and scope of government, not an increase. I'm usually with Gato, but there have been some real stinkers lately.