> "Readers of article say it makes claims X, Y, and Z."

says who?

"Intended for healthcare professionals" - it literally says so above the page header.

Edit: maybe fact checking systems need to label certain things as "This is a publication from a narrow domain venue intended for professionals. Specialized domain knowledge may be required to derive correct conclusions." instead of fact checking only the first few paragraphs using common journalistic standards because "users on social media only saw this title, description and thumbnail[...]".