Not much to see here folks. J. Mercola is just a garden variety doctor with an extra three months of courses on muscles and bones. No special training in infectious diseases or public health. Google him and you'll see he doesn't have much standing in the medical community. For example: https://archive.ph/Y2vos#selection-321.0-321.66

If you read the article you'll see he isn't talking about any discoveries of his own - he's just quoting an anonymous blogger who says of himself "Who is The Ethical Skeptic? No one of consequence. ... I hold graduate and undergraduate degrees in engineering, business, finance, and ethics" https://theethicalskeptic.com/our-story/

Not much expertise in infectious diseases or public health there either.

For further reading: Mercola has been selling snake oil for a lot longer than covid has been around:

2005 (https://web.archive.org/web/20160829201656/http://www.fda.gov/downloads/Drugs/GuidanceComplianceRegulatoryInformation/EnforcementActivitiesbyFDA/CyberLetters/ucm059189.gov)

2006 (https://web.archive.org/web/20140829062422/https://www.fda.gov/ICECI/EnforcementActions/WarningLetters/2005/ucm076069.htm)

2011 (https://web.archive.org/web/20140422230654/https://www.fda.gov/ICECI/EnforcementActions/WarningLetters/2011/ucm250701.htm)