I'm not certain I understand the argument here. The airport is in Reno, therefore the jet had to fly over Reno to get to the Reno airport. This is not the same thing as flying over densely populated areas of Portland/Vancouver unnecessarily which is precisely what the FBI Flight Path depicts.
BTW, I am very familiar with Reno and Reno is a fraction of the size of Portland/Vancouver.
Finally, flying in between downtown Portland and Beaverton in 1971 is not at all the same as flying over downtown Portland. Not to mention flying west of downtown Portland--which Captain Scott apparently insisted he did--is along a straight line when considering a Maylay to Canby path.