I am not aware of all that data those links cite. The data I have seen is TT and lab based, not riding in a pack based. That would be hard data to get I expect, but my guess is it is being calculated / guessed. The pros have gone aero 50mm profiles generally over 30s and over 80s. Add some gusty side winds and those different profiles can really be felt, contrary to what those slowtwitch articles were saying.