Flour (which I avoid) is not processed, it is ground just like nut butters (which I also avoid) are not processed. High quality olive oil comes from squeezed olives, which makes it refined. The problem with refined oils is it’s unatural concentration, which I’ve already covered. Vegetable oils and such are 100% processed.
As for backup you can read all about it from the experts instead of some random guy on the Internet. I recommend Dr. Caldwell B. Esselstyn and Dr. Michael Greger.