It also should be pointed out that he looked up the meaning of one word. He may well have known exactly what it meant, but just wanted to do a double check.
Surely no one believes that a Wiki definition isn't checked and rechecked against other sources, including medical dictionaries.
I looked up Polycythemia in Wikipedia because I know someone who has it, and clicking the "Talk" tab you see a whole bunch of stuff including this in a box:
This article is within the scope of WikiProject Medicine, which recommends that this article follows the Manual of Style for medicine-related articles and use high-quality medical sources. Please visit the project page for details or ask questions at Wikipedia talk:WikiProject Medicine.
Start This article has been rated as Start-Class on the project's quality scale.
Mid This article has been rated as Mid-importance on the project's importance scale.
Underneath this are comments suggesting improvements, pointing out alleged errors, oversimplifications, etc.
I expect an inaccurate or dangerously wrong article by some Joe Blow would get comments that should ring alarm bells to an alert reader.