One person's "less than 50%" is another person's "roughly half" and another person's "49%". Your bias is showing when you go with an unreliable and conveniently popular 90% figure, and by going with "less than 50%", and by putting quotes around the word "scientific" (which is inherently mocking - either you think it's scientific or you don't, but mocking the word itself or use of the word "scientific" is a bad look), just as the article choose to go with "roughly half".I already dealt with that here. That "scientific data" was just another poll. It was heavily skewed towards women and LBGTQ. They found less than 50% of the Native population was offended.
From your link, "I think there’s a way in which we can reach out to fans to help them to understand that they are contributing to the dehumanization of Native people." Their poll may have been 'scientific' but they also had an agenda.