Aboriginal issues are extremely complicated, I don't know that that element has much to do with being progressive or not.
Where it has become a problem is that, much like gender, is that there is a very tight narrative that is being allowed to be presented to people. That's both in terms of very grass roots problems, like addiction problems or economic issues on reserves, and also in terms of higher level political questions, such as how to deal with land rights or where First Nations government fits into the wider society. In some of these there are no clear solutions and in others there is a lot of disagreement about what is best and right.
The tendency among the media is to present only facts that fit into the narrative they want to push. The tendency among political parties has been to use these questions in a way that ultimately supports the issues or image they want to project. I was a Green Party member for a number of years, and I've been really disgusted with their approach to First Nations environmental questions like pipelines, basically painting themselves as the only ones who are looking out for and listening to First Nations communities which of course are anti-pipeline.
Except they aren't. I'm anti-pipeline and would be happy enough if it were true, but it isn't, most aboriginal communities have a variety of views and more than a few are really divided about it - just like everyone else. Flipping Elizabeth May going around presenting herself as the champion of First Nations people, and pipeline supporters as ignoring them, is pretty disgusting and IMO actually deeply racist, but very typical of the political discourse on the left. Present yourself as representing a marginalised group and you can claim a lot of credibility.
The Greens also lost the plot with sex work, gender issues, and even became less nuanced around issues like childcare. All because they are working according to an identity paradigm.