Yes - be sceptical. In many ways, doctors are more dangerous than “some random person”, because the doctors opinions, while just as ignorant and misguided, carry weight with us…
You do what feels good. If you dont eat another gram of carbohydrate for the rest of your life, (live long), you will be the better for it. Any person, doctor or otherwise, that says that carbs are essential, is stupid/ ignorant/ dangerous - run away from them.