score:6
Yes, if there is no dedicated sidewalk, you may use the cyclepath as described here (in Dutch)
Google translate of the relevant text:
You walk on the pavement or footpath (sign G7). If it is not there, you can walk on the bike path and bike / moped path. If those are missing, it is allowed to walk on the roadway.
IMO it's advisable to walk on the left side of the path, so that you see traffic coming, and you won't be surprised by cyclists passing you.