OSM also marks a route 9, which
this blurry sign confirms.
OSM also has the rerouting of 1A alongside 1B, the deletion of our route 3, the renumbering of Rt6 (inside Rt4) as Rt3, and the renumbering of our Rt7 (inside Rt4) as Rt5. This is backed up by the quasi-Streetview.
Sorry everyone who's travelled in Aruba, you are all losing mileage! I'll try and make it so that you get what you have travelled on the revised routes, but please check once this is all pulled in - there's definitely a slight non-trivial change for someone (moving the Rt3 point on Rt4).