Oh, I’m well aware of Upper and lower Canada . My family has been in Ontario since 1818. I was born in Upper .
But “Beginning in 1610, Lower Canada, a new British colony “ is simply poor research . Maybe Newfoundland?
As for the Red Ensign . Old John A. and following governments encouraged it’s use but unfortunately it was never officially made Canada’s flag.
In 1610 Québec was still a French possession, so I’m guessing another error in the article. IIRC the only British possession at the time in what is now Canada was Newfoundland; the conquests of Acadia and Québec and the land grant to Prince Rupert were much later.