8 of the fastest 13 East African born 800m runners of 2018/2019 have been suspended for anti-doping offences, and two of the remaining five are training partners with a suspended athlete. You would expect at least 1 or 2 of those five to be suspended in the future. WADA only opened its lab in Nairobi a couple of years ago, and Kenya is being forced to spend more money improving its testing, so the busts will likely increase significantly even on what they have been.
Over half the Kenyan male track team at the 2017 world championships between 100m and 5000m have been suspended for anti-doping offences.
The 2012, 2014, 2016, 2018 World U20 800m champions (all East Africans) have all been suspended for anti-doping offences. The current U20 800m champion is Emmanuel Wanyonyi, who has run 1:43 at 16 years of age.
If this was any other country or geographic region, they would have been banned from the sport years ago, and nobody here would be constantly expousing the fetish that they have some kind of genetic advantage. Nobody here claims that women from East Germany born in the 1950's had special genetic adaptations for the sprints and 800m. Nobody claims that Russian females have special adaptations for race walking. Nobody says that in one small region of China where Ma operated, the women had a special genetic adapation for distance running that blew East Africans away.
There is no need to explain East African domination by genes when they are getting busted every other day, when they couldn't break 1:43.5, 3:32.5, 13:06 and 2:09 before EPO came on the scene (and their 'domination' declines by the week).