Of course, you are right.
But in my experience, avian vets have made more mistakes than I can count. Most people don't take pigeons with PMV to a vet, as the diagnosis is clear. Those symptoms are not due to inhalation. That would involve rasping and wheezing, not twisting of the neck after drinking. Say what you will, but I am sure of that. Although I'm not sure about treatment, I wouldn't be so haphazard to suggest treatment intended for pigeons.
I was recently asked about whether the baby had a possible inner ear infection. It could cause this, but the fact that the symptoms are present only during eating and drinking is curious indeed.
I personally do not think a call with a vet, even if they are avian certified, is going to shed too much light on this. A vet has to take blood, test stool, take X-Rays, palpate parts of the bird, observe behaviour, and note weight among other things before making a diagnosis. If he doesn't see the bird himself, I don't know how helpful he can be.