Should Doctors accept that non medical professionals health advice is just as good?
Post-modernism is ludicrous.
The author made an appeal to authority that they obviously do not posses, and made claims which are obviously incorrect.
I have no disrespect for a layman in a subject, and much respect for a well educated layman in a subject (it usually takes more work to learn it on your own).
But when someone is nothing more than an ill educated layman, and makes an appeal to authority about being some ‘medical professional’ I must point out that changing bed pans and putting catheters in someones urethra doesn't qualify them to make pronouncements in Science.
Outside knowledge might well make them qualified to discuss the evidence, but apparently the author got their Evolution “education” from Creationists talking points.
“And should Engineers accept advice from non-Engineers about Engineering?”
If it’s useful, YES!
There is an old story, based on a true incident, about such advice:
A big moving van took a wrong turn in town and ended up traveling on a road with an overpass with low clearance. The truck struck the bridge hard and was jammed tightly, with several feet of the van crushed into the bridge. Wreckers were called but were of no avail; firetrucks, cranes were tried, but because of the terrain and orientation of the van, could not do much. The next thing to be tried was to be the cutting away the upper part of the van by blowtorch.
While the emergency teams were waiting for the welders, one of the children amongst the bystanders asked a policeman on the scene: “Why don’t they just let the air out of the tires?” Which of course worked.
The moral of this story is obvious and the answer to your questions in your post.
Having said that, I too, think this article is poorly written, and not at all convincing.