I'm arguing (and probably wasting my time trying to engage you intelligently) with your newspeak-type redefinition of racism to mean what it doesn't mean.
People noticing that race exists and that it has an effect on the way our society functions is not racism. Noticing that a documentary on a white sprinter uses racist tropes and reflecting on the reasons for that is not racism. You are falsely defining racism as "anyone who notices race is a racist." You seem to believe that the solution to racism is ignoring race exists - those who believe race has an ongoing effect on society and seek to confront, change and discuss it are "racist" while you are "colourblind" and therefore the problem doesn't exist if you refuse to notice it. This is flawed reasoning and is based on ignorance.
As a matter of fact I also disagree that white people identifying with other white people is racism - it is only racism if it reflects systematic and institutionalized notions of racial inequality. However, when white people still occupy a disproportionate number of positions of power in society - due to the systematic exclusion of people of other races - that personal preference is no longer a case of an individual identifying with another's story, but becomes institutionalized across the media. Combest's story is being treated as noteworthy because of race - and is based on assumptions of white exceptionalism where none exists.
White people are not a marginalized population. White people have every opportunity to participate in sports (and generally more economic capital to do so) - there are no rules banning white people from participating in sprinting at the highest levels like there were preventing Black people from playing major league baseball. White runners are not pulled from races so inferior black runners can replace them because white people cannot be on the field of play for victory as regularly happened in basketball. White people are not systematically prevented from being team captain and there are no rules limiting the amount of white athletes allowed on teams as was historically the case for Black athletes. White people have not suffered centuries of historical exclusion that rhas prevented them from receiving equal opportunity or chances in any aspect of society. It is impossible to argue that the lack of white sprinters is due to any societal, institutional, economic or political exclusion that has made it impossible for white people to compete at an equal level. In fact, from that article it seems like despite the lack of any historic injustice, white sprinters are given more than the usual opportunity to succeed - and unlike programs intended to redress historical exclusion for marginalized groups, there is absolutely no historical imperative for white people to receive advantages. It is impossible to argue that racism is responsible for the fact that white people have not been successful in sprinting or that this is equivalent to the active exclusion of black athletes. Black people were banned from tennis clubs and golf courses - no white people were banned from the track. That is the difference between racism - institutionalized and systematic discrimination - and other forms of prejudice or ignorance.