The colonial art in the Gallery of New South Wales in Sydney Australia has been re-presented from how I remembered it as a child, when I went there recently. Instead of all the old paintings of Australia from colonial painters being the only ones exhibited, there are paintings by Aboriginal artists, Chinese artists, that interrogate how prevalent racism was during that time, and how the myth of the white settler experience in Australia (which wasn't utopian by any means) only tells one side of the story. I am all for these new exhibitions that recontextualise old artworks. Art is a huge part of history and it's important to get multiple perspectives, especially from groups that were silenced.
It seems the Turner exhibition you saw is in the same vein as these new exhibitions and I support them!