Results of the 2021 election: The Liberals won 78 seats in Ontario, 15 in British Columbia, and 35 seats in Quebec. The Conservatives won 37 in Ontario, 13 in British Columbia, 30 in Alberta, and 10 in Quebec.

The only way you could rightfully blame the Liberals' victory solely on Quebec like you did would be if you claimed that Trudeau is in power solely because Quebec wasted 32 of their seats on the Bloc Québécois, and that you're wrongly assuming that all of those votes would have otherwise gone to the Conservatives. (Bearing in mind that the Liberals won the election with 41 more seats than the Conservatives, so those 32 seats wouldn't have been enough.)

The Liberals received more than 40% of the votes in New Brunswick, Nova Scotia, Prince Edward's Island and Newfoundland. They received more than 1/3, but less than 40%, in Ontario, Quebec and the Territories. The problem of retarded voters wasn't unique to Quebec, and I'd argue is far more concentrated in Ontario.