This framing seems disingenuous given the already far reaching effects of the frozen funding, the layoffs, the shut down of communications, the shuttered offices, and, apparently, giving non government employees unfettered access to its computer systems.
But yes, shutting down the USAID or trying to muddy the waters by saying it'll totally still exist, they'll just somehow run it out of the state department and not fund anything should indeed not be possible without an act of congress.
1: https://uscode.house.gov/view.xhtml?req=(title:22%20section:...
> Not later than 60 days after October 21, 1998
I’m pretty sure it’s now 2025, which is more than 60 days after Oct 21, 1998. Therefore, the president does not have power to abolish USAID. Please try again.
>> Memorandum of President of the United States, Mar. 31, 1999, 64 F.R. 17079, provided...
(It was actually delegating power to revise the USAID reorganization plan—which was not a abolition—and to set the effective date of then part of the reorg that was not transfer of mandatory functions to the Secretary of State.)