The map doesn't specify default routing - it just describes the features of the area, and the routing tool picks what it thinks it likes. I did check the path tagging to make sure everything is correct, and while I made some minor fixes, nothing looked wrong enough to prevent routing.

However, as someone who rides here regularly, I actually tend to avoid the path... I will either use Lashley or Toedtli further to the west, the path has so many sketchy intersections. That might be what the routers are picking up on, vs a 20mph road.