I do wonder about the methodology here, the flaw I've seen in most of these kinds of studies (for video games and other visual media) is that they like to conveniently gloss over the fact that the negative associations and aggression levels tend to drop to normal levels for that person fairly quickly after they stop playing.
The method for these tests in measuring aggression is also really hard to extrapolate. In this case, that hot sauce test, it doesn't really tell us much about increased aggression, beyond what one would expect from a slight adrenaline rush, the increased aggression exists due to the stimulating imagery, and quickly drops back to normal levels after the aggression test is administered. It's that flawed methodology that produces the majority of the "video games cause violence" studies.
That's not to say there's no merit here, despite what people love to claim about how media can't possibly ever effect us (often an overreaction to counter the video games cause violence hysteria) the media we consume can effect us. Whether it's confidence and self-esteem levels in minority groups who are underrepresented or stereotyped in media, or the perpetuating of confirmation bias towards negative or positive stereotypes. If gamers are playing a lot of racial stereotypes, then it is very likely that those stereotypes can influence their thinking in subtle or unconscious ways.
Doesn't change the fact that this study amounts to an exploratory first step at best, I would have to read the actual published paper, but this sounds like a fairly informal non-comprehensive study meant to test a hypothesis, with more serious in-depth study to follow if they can wrangle the funding from their university. Personally, I hate the methods behind testing "aggression" in these kinds of studies. Way too often, the entire thing is predicated on testing aggression right after stimulating the subject, with no form of followup to see if the increased aggression is the new norm, or just a temporary effect from stimulating the person you are testing, and then compounding that by asking them undertake aggressive acts.
Studies like these are often riddled with these kinds of questionable details though, it's compounded by a sensationalist media that exaggerates and draws correlation where there is none, and the inherent difficulty in studying the soft sciences like social construction, and human psychology. Somehow, I have a feeling that further study will reveal the change in behavior to be temporary, or statistically within the margin of error for test subjects, but the media will conveniently forget to follow up on it because the initial hypothesis will be more exciting that the actual truth of the matter, which is that human psychology is complicated, and very hard to pin to any single source.