I'd really like you to be specific about why you think this, you haven't made the case here in a way I can understand.

To my mind, all we know right now is that he went into these businesses (that he'd frequented before) and shot whoever he found inside because he saw them as enabling a problem he wanted to stop.

Yes, we can talk about the fact that he'd chosen these businesses to go to for sex. Maybe that was fetishisation, maybe it was simply attraction (there's a difference), maybe they had the lowest rates.

But even if we take the most racist adjacent case and assume he had a fetish for Asian women, we're still a long way from saying that he killed them BECAUSE they were Asian. What we know right now is that he killed them because he couldn't stop himself going to massage parlours.

Just to add, we know that he was planning to kill some people related to the porn industry but we don't know anything more than that. What if they had turned out not to be Asian? Would that change your opinion?