Does someone care to clarify the credibility of the author and his content?
What are the potential outcomes here? You're sure to find people on this site (whose credibility you also can't judge) who claim he's the antichrist and others who claim he is actual Jesus, mostly depending on what their social circle happens to believe. What do you do with that information?
That said, John Campbell is one of the few YouTube sources I've found myself continuously going back to throughout the pandemic. Like anything else, I take things he says as "Ok, now I know someone has said this", not "OK, this is a thing that I now know to be true".
Credibility of the author idk :s
"Campbell worked as a nursing educator at the University of Cumbria, and has experience as an A&E nurse. He has also taught health workers in India and Cambodia. He is the author of Campbell's Physiology Notes and Campbell's Pathophysiology Notes nursing-related biosciences text books. A 2011 book review in Emergency Nurse magazine said Campbell's Physiology Notes was "excellent, inexpensive notes on the causes, pathophysiological changes and clinical features seen in disease processes"."[1]
To be fair, a good chunk of his Wikipedia article mention his videos about Ivermectin and how they're false claims based on some articles people have posted in response to his video, which is to be expected since anything positive said about Ivermectin is bound to have people counter it.
Dr. Campbell has posted almost 2000 videos, pretty much every day since the pandemic started (although if you sort by oldest on his channel you can see 14 year old low-res, poor audio/lighting videos[2] of him going over various medical concepts, btw, pretty interesting), where he reviews and explains probably 20+ charts and graphs and statistics and quotes and studies to the best of his understanding.
He's also human and may very well have been led down a wrong rabbit hole by his interpretation of some studies (or perhaps not, Ivermectin seems to have become one of the things that everyone decided they'll believe in its efficacy based pretty much exclusively on political party alignment).
You should always take in information with a critical eye, including Dr. Campbell. I've watched probably a hundred of his videos and I don't always agree with his conclusions 100% either, but I can't say that about anyone ever, so I don't expect that of him either. What I have seen is, especially on his more general update videos, the most comprehensive compilation of data (as digestible to a layperson as possible) for complicated medical concepts.
This is something I find very funny. As someone from outside the USA, it amazes me how something like this got politicized over there. Does Ivermectin have any effect against COVID19? That should be a dialog left to scientists following the scientific method. All that craziness of "ZOMG horse dewormer" from the left (ignoring that there ARE IVM pills for humans) and "ZOMG Muh Freedom" from the right (ignoring how how virus and vaccines work) is just mudding the scientific research around the thing.