Because they're lying. They proved time and again that blatantly and shamelessly lying is a viable and effective strategy with no negative consequences, so they're doing it again.
The executive branch has no inherent authority to create agencies, let alone hire employees, aside from those already authorized by Congress.
The only thing the White House can do is create advisory committees, which have no authority to execute policy. There is established case law on this. They must have a written charter, all their work is subject to FOI, and there is a limit on the number and pay set by Congress.
Free Speech in trump era: you can say whatever you want wherever you want, nobody has to believe you. Words are meaningless, money and gun speak for themselves.