Something that people should keep in mind is that the fees were lower for those "out-of-province" students in Québec than in their own province.
This fee raise basically brings it on par with what they would pay in their on province. One of the reasoning behind this law is that Québec shouldn't be subsidizing other provinces way too expensive university system.
If you are living in Québec, university fees are quite cheap, and this doesn't change.
The French vs English aspect is widely talked about, but not a whole lot is mentioned about the actual price hike.
This government (CAQ) has done many xenophobic thing. Restricting access to services in foreign languages to accommodate new immigrants is probably the best example of that. But this university thing, I don't think it is. Most of the time, if you go and follow and Bachelor's degree in another country, then you have to learn the language of that country because not every class is given in English only (of course there's exceptions, but most of the time it's like that). And you have to pay a hefty premium to go and educate yourself abroad.
This situation is way different, studying at university of Toronto is 16 000$ if you are from Ontario and 17 000$ if you are from another province. So it was often cheaper for people to go and study in Québec. This fee raise doesn't have anything to do with xenophobia or anything, this is merely bring the prices to the "market value". Yes there's a bit of language protectionism, but it's not all that inconvenient, and as someone already said, just trying to learn French is probably sufficient to get around it.
In short, I agree that there is xenophobic things that happens in Québec. I agree this provincial government doesn't have a great track record on that front. But this change isn't motivated by xenophobia, but other reasons. Up to you to decide if they're valid or not in your opinion.