What can parliament or the courts do about a hypothetical?
It all depends on the view of the courts that consultation is conducted in a honorable way.
It's a nation (Canada and through the constitution delegated to the province, or in some cases project proponent) to Indigenous community. But there are some established criteria
1) the project must be clearly defined and potential impacts to constitutionally recognized rights identified.
2) it must be a plain language document. Which means no gobbly-gook verbiage and must be clearly understood by the community
3) it must allow sufficient time to ensure the community has a) recieved the document b) been able to raise concerns c) have the concerns raised addressed by the proponent on how they wish to address them (if possible) d) proponent mitigation reviewed by the community. At a certain point the proponent can go to the crown and ask for a ruling on consultation.
4) The crown must be able to demonstrate the project - as described initially - was considered along with all feedback and mitigation proposed. It is to be considered in the final approval of a project but if not accepted then justification as to why is also required. Hence an informed decision vs. rubber stamp.
Not a lawyer but the above are common discussions when proposing or reviewing consultation projects and communications.
So when I look at that referendum question the following arguements could be made:
1) the project is not clearly defined and the potential impacts to constitutionally recognized rights/treaties is significant
2) it is not a clean, plain language decision
3) Commencing consultation today, for a decision of this magnitude, with concerns raised, would be tough to have completed by October. Simpler projects generally start at a month+ for consultation and many taken 4-6 months on routine matters (in part due to number of communities/holidays/timing of meetings etc.). This is every Indigenous community in Alberta plus some recognized groups in BC.
4) An argument could be made, especially in light of some of procedural committee issues/pre-recorded press release events that this is a pre-determined outcome and consultation will not be considered.