He is merely stating his opinion about medical treatment plus informing the people that he olds a doctor's degree.
Publicly stating that engineers are wrong and at the same time proclaiming he is an engineer? I think you are disregarding those two pieces of facts.
I think he can do that and should be able to do that without fear of being prosecuted by some over-zealous civil servant.
He has been told to stop using the term which he ignored. The board has no say about the merits of his claims. In fact they're already told him that the state board has no jurisdiction on the traffic lights of the City of Beaverton as that is controlled by the city.