Regardless, Goldfinger is still correct on all the statements that you've quoted. In addition to the scientific content, it still is possible to spend several lifetimes in the PNW (which does extend beyond King County) in between the 1700 event and the 2001 event. Granted, there was the 1872 event near Lake Chelan [2], which was the biggest PNW quake since 1700, but still... there were multiple generations of people born in between 1872 and 2001.
[1]: http://www.geodesy.cwu.edu/instruments/tilt/explanation_ETS....
[2]: http://www.seattletimes.com/seattle-news/scientists-may-be-c...
I agree this is very misleading, but as they tell it through the historical lens, this earthquake also hadn't happened before they realized there could be earthquakes or that they could be big.
I felt that one - I was over in Eugene for the weekend of the 4th, and was... uh... seated, when it felt like something slammed into the house. Not much shaking, just one short, sharp impact.