According to the article, at least one of the victims was black. A shift manager, IIRC. The other two were fellow employees. One was white. Engaged. The third person’s race, I don’t recall.
He, the murderer, may have been motivated, as you say, at least in part by race. It is too early to know at this point. What is clear from the victims is that he is an equal opportunity murderer.
As the investigation unfolds, where the three were sitting may prove the most important factor. Were they the first three the shooter encountered or did he bypass others to reach where they were sitting?
If he bypassed others, that implies selection, and selection, in turn, implies criteria. And criteria contradicts randomness.
I dunno. This could be just another violent ding. We’ll have to wait until they decide to tell us what this guy was about. If that ever happens.