It's definitely possible, but Garza is also a really common Hispanic name. I could personally name a few Garza's off the top of my head who aren't related at all actually lol.
That being said, this all sounds sketchy as hell already, so who knows? Can't say it would surprise me at this point.
So I get what you're saying. It seems obvious who is receiving the abuse so why not just say it?
But it's not about keeping a secret (IMO). It's about not putting all of the attention on the one person over and over again by stating the victims name over and over again and singling them out. (If it was me, I would hate it and feel much more alone)
Instead here it's a group being mentioned which should hopefully spread the hate out. Maybe it won't work but nothing else really has either when this happens. And at least maybe the person will feel supported.
I'm not sure why you feel they shouldn't have said anything though? The racism is very public so not saying something publicly would be wierd right?
Also I feel like people are forgetting that maybe the victim okayed all this and wants it to go this way?
Maybe not but I feel like you can find the reasoning behind these decisions if you try to see it from other angles.