He's directing the Corp for Pub Broadcasting to not fund them. That is within his power as POTUS.
Just because Congress authorizes spending, doesn't mean the money has to be spent.
Arguably ... of course, there's an element of political theater here. A judge will thwart him, it will become a visible public issue, and he'll force Congress to eliminate funding all around.
Trump wins one way or the other.
Imposing corporate abuse, neglect and greed on deserving victims.