I think you'd be well advised to get some further analysis on this.
The only real point I would make is that with clause 6, like much of the act, it's very difficult to see how it would operate in practice. The reason I say that is because the rights of aboriginal peoples are recognized and affirmed broadly in section 35, and then there's a framework for defining what those rights are, either through the common law or through treaty-based mechanisms.
A narrow reading of clause 6, which is likely what would be offered by the Department of Canadian Heritage, would simply state that rights related to languages are not excluded from the definition of section 35. They are already not excluded from the definitions in section 35, so it could actually be quite redundant.
On the other hand, someone like me would try to read that as broadly as I could, to suggest that where there are existing aboriginal rights, they have a linguistic element to them. I don't think that would necessarily lead to the life or death of the bill. I do think it could contribute to ongoing disputes about the scope of the interpretation of that section.
The only other thing I would point out there is that recognition does not run through the act, which is really interesting. It's almost like there's this blanket recognition of section 35 rights there, but then our organization, and Inuit broadly, are complaining that the act itself doesn't provide any vehicle to implement those rights. It's an odd provision.
It's not something that I would consider to be fatal, but I would say that the ambiguity itself is potentially concerning to some.