The problem is colonialism meeting a cultural protocol that has been present for centuries and centuries. There are many non-colonial entities that still operate within first nations, Métis and Inuit communities and spaces, such as the Ghost Warrior Society or medicine societies that exist and uphold our cultural integrity.
When it comes to procurement and engaging with those organizations, you are validating their processes. That is probably not a colonial approach, but it is a lack of colonial mindfulness about how first nations, Métis and Inuit identify ourselves outside of colonial mechanisms and frameworks. That is keenly important in furthering the economic growth of first nations, Métis and Inuit.
I hope that answers your question. If you have anything more specific, I'd be more than happy to answer.