I don't think there's much to add from what has been said before. The federal understanding of this is that the term is being applied in the context particular to this bill, so “Indigenous governing body” here isn't with a broad definition that could capture all these others in a way that you're describing. It's applied here in the context of Métis governments authorized to represent Métis collectivities, all of which are listed in the schedule.
On December 11th, 2023. See this statement in context.