Mate sounds like you have benefitted from the Carnivore diet and thats great.
There are loads of criticisms that can be levelled at this research though (not just carnivore but many other extreme diets). Theres hardly any randomised control trials, lack of demographical info on participants, studies are run by those with financial incentives to gain, no longitudinal research (what are the long term health effects), over stating claims, lack of replicability just to name a few.
A relationship doesnt necessarily mean causation. How have the studies accounted for the stack of other variables that come with an extreme diet? for example how do they know if some of the purported benefits come from a reduction in processed foods, an increase in exercise?
The best way around confirmation bias is not just to be aware of our own values and leanings but also those of the people making certain claims, acknowledge we all do it (even when we think we aren't) and understand the difference between good and poor quality research.
The diet and nutrition industry is flooded with poor quality research and peverse incentives.