Donald Trump actually said...

dividing up certain assets

hereby declared void, vacant, and of no further force of effect, because of the fact that they were done by Autopen.

Any further attack or retaliation by the ‘Houthis’ will be met with great force, and there is no guarantee that that force will stop there.

In other words, Joe Biden did not sign them but, more importantly, he did not know anything about them!