No he didn't. He said it standing next to the President, and he didn't disagree with the president. He even said it showed potential. He simply explained that the specific evidence being cited was anecdotal, not a clinical trial. He was not wrong. Nor was Trump when he said it showed promise.
The doctors claiming that it works also claim that they ran a controlled study.
It’s not that complicated for a drug that everything is already known about.
Let people try it.