I spoke of EPO because the documentary of Seppelt spoke of EPO only, and your question was connected with Seppelt's (fake) investigation.
Everybody who continues to say "according to Renato, EPO doesn't work with Kenyan" is clearly acting in bad faith (or, in alternance, is an idiot) because I never said something like this. The subject is not a Kenyan person, neither a Kenyan athlete, but is "top athletes living and training in altitude with proper training". In mathematic, there is the "common denominator", and every person in bona fide, with a normal IQ, understands which is in this case the subject of my belief.
After 10 years, in spite of a growing number of banned athletes, I didn't change my idea, because no new scientific proves came from researchers for clarifying the real intervention of EPO in the general improvement regarding the times of performances in long distances.
Can't be a proof the fact that "If several athletes dope with EPO or similar, why do this, if doesn't work ?", because I can reply "If several athletes who are at the top of the World are able to do their performances in clean way, how much can be the real influence of doping on the performance, when there is very advanced training ?".
You can say there is no proof that athletes at the top, never officially caught for doping, are really clean, and this is true. I say that athletes REALLY clean (and I know many of them) are currently WR holders, and this also is true.
The big difference is that you have already in your mind the "stereotype" that top African athletes MUST BE DOPED, also without any evidence, and refuse the idea that is possible running son fast in clean way, creating a category (all african top runner) that doesn't exist and giving for that category general parameters, like everybody is exactly the clone of the others.
This happens when somebody speaks, in general way, of big and wide categories, trying to homologate the individuals : "Black people", because the common denominator is the color of their skin ; "Islamics" or "Christians" because of their religion ; "Fascists od Communists" for their social phylosophy.
Do you know somebody who wants to buy a car, and goes to the salesman asking "I want a red car", and when the salesman asks him "which type of car : with 7 seats, with 5 or with 2, very fast of with medium speed, petrol or diesel, 4 wheels drive or 2, a medium powered car of big powered, etc...", the answer is "I don't care, the only factor I want is the car must be red" ? I think that person doesn't exist, because everybody look at what the car can do according to their need, and the color is the last important particular. Everybody looks at what there is "under the hood" (called ENGINE), not only at the external picture.
People speaking about wide categories, instead of individuals, have the same behavior, and this can be called RACISM, because there is the refusal to know the individuals, everybody with his own problems and his own history.