Picking the WCA is also cherry-picking. The 2022 AIU report is not yet available, but in 2021, the AIU collected samples at 144 competitions sanctioned by WA. It is unlikely that the pinnacle championship event with a subset of disciplines with limited participation would be a representative cross-section of 144 competitions.
Regarding pools, in 2021, although 839 athletes were in the International Registered Testing Pool, the AIU collected samples from 2,229 different athletes. So while 130 out of 800+ athletes (16%) might be in the testing pool, this is not necessarily indicative of the number of samples collected from Kenyans by the AIU in 2022.
What is sure that leaking the stat of 40% positive tests from Kenyans without providing context is not neutral.
Several reasons WCA is not representative is that 1) WCA limits each country to 3 or 4 participants, and 2) not all WA disciplines are WCA disciplines, and 3) many of the 40% were not World Championship athletes.
The point of looking at the larger quantity of high performers was as a rough proxy indicating there is certainly a higher number of samples collected and athletes tested as a consequence of the higher quantity of elite performances. If (hypothetically) 40% of the samples are from Kenyans, then 40% positive tests would tell us that the positive rate for Kenya is about the same it is globally, and the large positive result is a direct result of the larger number of samples collected.
All of this so far assumed uniform testing across all events and all WA athletes, which we also know from AIU reports is not the case. In the AIUs words: "The AIU’s testing is focused on elite top-end athletes and is designed to be specific, targeted and intelligence-led."
The AIU testing is biased towards distance events, especially the roads, and Africans:
In 2021, 61.4% of the AIU samples came from Long Distance Road (32.7%), Long Distance Track (17.8%), and Middle Distance track (10.9%) events.
In 2021, 39.4% of samples were from Africa.