Please add Retraction Watch to the list at my April 2, 2020, post:
How to Evaluate Covid-19 Resources: the Good, Bad, Puzzling, Outdated, Rumor, Un/Official, and the Profiteering
Never believe anything other people tell you, especially if said with Great Authority, and no qualifications. Look it up, check it out, put it to the test. Doubt takes time, but it takes less time and less money than lawsuits.
Peer-review, juried exhibits, law review source checks, etc. all serve the same purpose: to impose a little Scientific Method on any claim to knowledge, truth, genius, originality, and accuracy.