Quoting from the first link: "In the case of red meat, the classification is based on limited evidence from epidemiological studies showing positive associations between eating red meat and developing colorectal cancer as well as strong mechanistic evidence.
Limited evidence means that a positive association has been observed between exposure to the agent and cancer but that other explanations for the observations (technically termed chance, bias, or confounding) could not be ruled out."
This is garbage science. It's all like that. Believe whatever you like, though.
Q&A on the carcinogenicity of the consumption of red meat and processed meat. https://www.who.int/features/qa/cancer-red-meat/en/
Position of the American Dietetic Association: vegetarian diets https://www.ncbi.nlm.nih.gov/m/pubmed/19562864/
Position of the Academy of Nutrition and Dietetics: Vegetarian Diets https://www.ncbi.nlm.nih.gov/m/pubmed/27886704/
Nutrition concerns and health effects of vegetarian diets. https://www.ncbi.nlm.nih.gov/m/pubmed/21139125/
Why Doctors Don't Recommend A Vegan Diet | Dr. Michael Greger https://www.youtube.com/watch?v=_d1Ca6SsKfE
New Canada Food Guide: Some Can't Handle It https://www.youtube.com/watch?v=lp4zWaLE_ik
Unfortunately lies and fake science affected by a personal or political or financial agenda confuse people.