He doesn't look Hispanic to me, and a male Hispanic would not generally blow away four women, two of them elderly, at a perfume counter; if he was mad at his girlfriend, he might stab her, but he sure wouldn't come in armed for bear and kill female bystanders.
REmember that the police are now describing ME-looking men as "Hispanics" - they did this in Orlando, San Bernardino and most recently in NYC. Anything to protect the Muslims from their own actions - I guess Hispanics don't rate as high on the PC scale so they can casually be accused of terrorism with no fear of anybody's objecting.
Aside from that, I suspect that this was a Muslim "honor killing," and that the reason none of the names of the victims have been released is that at least one of the younger women has a Muslim name and was the sister or possibly even wife of the killer.
This is, of course, pure supposition, but to me it makes a lot more sense than other scenarios...