Once again you ignore any legal basis.
Since when if there is a conditional gift, can Québec attempt to say the gift is not conditional?
You're promoting a form of tyranny. You are saying that the people who live in that territory today are not entitled to self determination because of some historic treaty that was signed long before they were even born. Well, you can't strip away rights like that--those people are entitled to self determination REGARDLESS of the current constitutional framework. Specifically, they're entitled to rewrite the constitutional framework that governs their lives, through an appropriate collective democratic expression of their will. You cannot deny their right to self determination by saying, "hey, your ancestors were given that land you live on, the only home you've ever known, the place you were born--so you are really not free people, you are actually just serfs living on the land, which really belongs to the descendants of the people who gifted it to you generations ago, even though they haven't ever lived in the territory, as you have."
That is a complete non-starter. Self determination is a current, immediate right held by the people currently living in the territory. It is a current, living thing.
Now, if you could show that Quebec was divided up into distinct electoral jurisdictions, and show that a separation vote was overwhelmingly rejected in a well defined jurisdiction, you could advance an argument that people in that jurisdiction have their own right to self determination, and that could get a little messy. I don't think any sane person would go riding by riding, but if, say, the entirety of Northern Quebec voted against separation, then perhaps it should be severed off, to respect the rights of those people. But that is quite different than your radically anti-democratic assertion that the people living there are just serfs who don't really control their own destiny.