I agree with the authors.  Also one needs to consider that history has been pretty much out of the high school curriculum for a while so we can assume the 20 and 30-somethings who now work at CBC don't really have much historical knowledge and are just doing the best they can.  Also, regarding the point that 12,000 years of indigenous history is given short shrift compared to 150 years of New France, a defense might be (aside from the fact few records exist documenting indigenous history) that North American life changed more in those 150 years than in the previous 120 centuries.