Realize too this high intellectual level of introducing doubt could either laziness and incompetence/bad science and review, or it could be more malicious and could be the industrial complex wanting their vaccines as the only treatment and therefore only thing sold; there can easily be intelligent people hired to write hit pieces on anything to add doubt, to go along with the insanity of platforms like Twitter, Facebook, YouTube agreeing to be complicit in censoring legitimate questioning and criticism; did you actually watch the full 2nd video I linked, and do you really think he'd - a front line worker with incredible experience in this domain - be lying?
Here's a simpler, less complex example of how people think they know what they're talking about and then regurgitate the conclusion (because they believe they're more competent than they are):
(Going to edit to add re: poorly done Ivermectic research concluding no statistical significance between Ivermectin being used as part of treatment, no experimental structure to it to determine a protocol, short length use compared to full 14 day treatment period, and inadequate dosing)
I'd recommend watching the second video too - that front line research doctor is very credible as well - you'll have to decide for yourself what narratives you start believing or being open to vs. shutting them down - which will all depend on how you orient yourself in the world which depends on how much time and attention you put to go deeply into a topic to determine for yourself vs. being sidetracked and just agreeing with some other internet stranger's "opposition" which then prevents you from digging into the original presented sources (where the bird-group.com also links to the related research done if you truly want to do a deep dive - but the 2nd video is a where what's in the research is shared in easily consumable video format).
https://www.deplatformdisease.com/blog/addressing-geert-vand...
https://www.snopes.com/news/2021/03/26/geert-vanden-bossche/
And the second:
https://www.bmj.com/content/373/bmj.n747
https://ebm.bmj.com/content/early/2021/05/26/bmjebm-2021-111...
I've really enjoyed Bret's podcast for the most part, so I was really disappointed after looking further into these subjects and finding that he seemingly isn't approaching them in good faith.