they aren’t cell diseases. It is plant toxins either leaking into the blood stream through intestinal permeability or a problem with peoples livers being fatty and not able to do their job anymore resulting in the bodies inability to remove plant toxins. The toxins cause an immune reaction wherever they build up , rheumatoid arthritis if it’s the joints of the legs and arms etc. Plant toxins include pesticides, fungi…
Whenever the carnivore diet comes up as a panacea (which it does, a lot), I wonder if people tried anything else. Did they try reintroducing plant foods to test their hypothesis?
Personally, I bet that it's not the diet itself that helps in most cases, but that the very act of changing one's diet radically alters the gut microbiome. People with autoimmune diseases usually have a dysbiotic gut flora, so it makes sense that a radical change would "reset" it. However, this would suggest that reintroducing foods should work, unless you reintroduce things that bring back the imbalance.
Anecdotally, my psoriasis disappeared after I switched to a strict vegetarian diet. I can't prove it, though, so I don't go on Reddit making unscientific claims I can't back up with evidence.