In 2016, when the main momentum of this started to come out, 9 in 10 Native Americans did not find it offensive [1]. But white people had already decided it was offensive, and white people have much more cultural influence than Native Americans, so in being perceived by white people as offensive it became offensive, to the point that just a few years later, a majority of Native Americans found it offensive [2].
But at all times through this, including today, a higher percentage of white people find the Redskins name offensive than of Native Americans. The Redskins changed their name because of pressure from white people, not because of pressure from Native Americans. More than a little ironic that even in this, Native Americans were barely listened to, while white people's feelings were considered very important.
[1] https://www.washingtonpost.com/local/new-poll-finds-9-in-10-...
[2] https://news.berkeley.edu/2020/02/04/native-mascots-survey/