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It was very common for people in general to claim that eg French Canadian was 17th century French (my Italian French teacher back in the Gymnasium said that)
****GK: When I was a very young college student in Montreal, I was told (in passing, in a French literature class) that French Canadian had retained many aspects of the 17th c. dialect from the area of Western seaside France original immigrants had come from, and the professor gave us a few examples. The only one I remember is actually a pronunciation of "ici" (=here) as "icitte" (=ea-sit) like in the expression "viens ici" which in "incorrect" rural Quebecois (and Manitoba French too for that matter) is pronounced "viens icitte". The prof told us that that was still the way they pronounced it in Vendee or thereabouts in Western France.*****