Which guy is racist and practicing racism?
Unknowable.
Individual of color A refuses to hire people of color B because he thinks they posess trait C.
He might also refuse to hire people of all other colors, including his own, because they equally possess trait C as color B.
A simple binary test could have been applied, to see if he would hire someone of his own color, but this was not tested, so we are working on assumptions.
Had the binary test been applied, we would then have to determine if people of color B actually possess trait C to a higher degree than people of color A.
If so, his decision would not be racist, because it would not be derived from any notion of inferiority/superiority on basis of race, but rather statistical evidence regarding the trait.
Tangent A.
However, in an effort to better society, it should be taken into consideration that this decision could nevertheless influence the degree to which people of color B possess trait C.
We can take as a given that traits do not arise spontaneously, but require the correct environment variables to develop, gainful employment often being one of those variables.
Depending on other societal variables it may or may not prove profitable to intervene in the hiring process. This would be social engineering in an effort to combat something we could call "systemic racism".
Tangent B.
Furthermore "systemic racism" is a poorly chosen name. While it has emotional impact it lacks logical consistency in what it attempt to accomplish.
A given state in the relationship between a majority and minority populations says nothing of what the basis for that state is, and hence whether said state is unreasonable or not.
On the other hand, anyone should be able to see that measuring skin melanine levels is no basis for determining honesty or thrift. Those traits are rooted elsewhere in the body, and not well understood anyway.
Sorry... What was the question again?