Not sure...
Interestingly, when this all started a few years ago, the Seminole tribe gave their blessing to Florida State; they looked at it as honoring their tribe. Not sure why "Indians" as a general term is so much worse. "Redskins" is easier to understand why that term is considered derogatory.
The real litmus test is what about the Note Dame Fighting Irish? And their little pissed off leprechaun logo? Is that OK?
Yes, Notre Dame is ok because...
1. People know it's a nickname, it's not life or death, it's a white person...and
2. It's sports, it's supposed to be light and not taken so seriously
We have a real weird dynamic going on today. People, all races and genders, are calling for "equality". Yet at every turn, minorities and genders (women) separate themselves when it only benefits them. I don't think anyone is negative towards Black Lives Matter, but the notion is that we should believe that ALL lives matter, but that's not good enough for them. It's just nonsense.
Just when you treat everyone equal, they want to be separated, the LGBTQ movement for instance.