Unless abolished pursuant to the reorganization plan submitted under section 6601 of this title, and except as provided in section 6562 of this title, there is within the Executive branch of Government the United States Agency for International Development as an entity described in section 104 of title 5. [1]

And here's the text of section 6601, which explains how to abolish USAID:

(a) Submission of plan and report Not later than 60 days after October 21, 1998, the President shall transmit to the appropriate congressional committees a reorganization plan and report regarding-

(1) the abolition of the United States Arms Control and Disarmament Agency, the United States Information Agency, and the United States International Development Cooperation Agency in accordance with this chapter;

(2) with respect to the Agency for International Development, the consolidation and streamlining of the Agency and the transfer of certain functions of the Agency to the Department in accordance with section 6581 of this title;

(3) the termination of functions of each covered agency as may be necessary to effectuate the reorganization under this chapter, and the termination of the affairs of each agency abolished under this chapter;

(4) the transfer to the Department of the functions and personnel of each covered agency consistent with the provisions of this chapter; and

(5) the consolidation, reorganization, and streamlining of the Department in connection with the transfer of such functions and personnel in order to carry out such functions.

The President can abolish USAID, or can streamline it, or terminate functions within it, according to your own provided links, and only has to submit a report about it.

1: https://uscode.house.gov/view.xhtml?hl=false&edition=prelim&...

2: https://uscode.house.gov/view.xhtml?req=(title:22%20section:...

“Not later than 60 days after October 21, 1998”

That provision expired 26 years ago.