The highly biased and incorrect poll by the Washington Post, supposedly advancing the idea that Native Americans had no problem with the previous name, was long ago debunked. It did allow racists & bigots to push their discriminatory narrative for a while though.
A New Study Contradicts a Washington Post Poll About How Native Americans View the Redskins' Name | Washingtonian (DC)
"But a new study from academics at the University of Michigan and UC Berkeley contradicts that data. In a scientific survey of more than 1,000 Native Americans, roughly half of the participants said they were offended by the Redskins’ name. Moreover, 65 percent said they were offended by sports fans performing a “tomahawk chop,” and 73 percent said they were offended by fans imitating Native American dances."