Looks like to them bike able means flat!
Seattle Bike Infrastructure
Raw USGS Elevation Data Used For Hill Score
To calculate the "hilliness" of an area we look at the steepest grade within a 200 meter radius of the origin. A grade of 10% - 2% is given a score of 0 - 100. Our data source is the National Elevation Data set from the USGS.
Sorry even getting older and fatter (and I never was a mountain goat on a bike) I find that stupid. If I can't get anywhere without stupidly steep hills is a negative. BUT no hills, no fun canyons and rides to overlooks where one can look out and say they accomplished something is a bigger negative.
Oh and wide open and flat everywhere translates to killer winds. I'm big and fat enough I do pretty well, but time in a sandblaster is no fun, even for me. (Tis good for the ego to have a long line sucking me wheel however).