True facts:
He has a Kenyan birth certificate. He has a Kenyan passport. He is a Kenyan citizen. If he wants to change his allegiance to another country for Athletics, according to World Athletics rules, he needs to wait three years.
He can’t even begin this until he is a US citizen.
World Athletics are preventing athletes from changing allegiance because it’s ruining the sport.
If he really wants to run for the US, he has a long wait, essentially his peak performance years.