Injustice and inequity don’t have statutes of limitations. Racists don’t get a pass because of historical contexts. If the organization wants to acknowledge, discuss and grapple with the checkered past of Audubon and several of his fellow ornithologists, that’s their business.
Deal with it.
From Audubon Magazine: The Myth of John James Audubon
https://www.audubon.org/news/the-myth-john-james-audubon
The same sort of thing can be and has been said of Woodrow Wilson and Margaret Sanger, among others. Racist attitudes may not have a statute of limitations, but they do have a historical context.
According to the best extant records, the historical Buddha was staunchly pro-life, fairly sexist and possibly even homophobic by our standards. Cancel Buddhism? Or consider the context of India 2500 years ago?
Private organizations are free to judge historical figures by our current standards if they wish. Others are free to disagree with that approach.
Deal with that.