OSM is not an official source and what does or doesn't appear on it can change at editors' whims. I wouldn't treat that as relevant.
There is an official list of routes here,
I know the document from wegenwiki. Is it "official"? It's dated 2002-04-25. I think there have been changes in the past 20 years. Minimum due to construction. The document does also not indicate any source.
Nonetheless, I've gone through wegenwiki / wikisara route lists for existance when drafting beln system. Then, I'm gone with wegenwiki* article map (if available) + OSM + GM about routing. If it differed, I checked GSV. If wegenwiki mentioned a route but I couldn't find it on OSM nor GM, I omitted the route.
Before, I only added routes which were also signposted (GSV check), but I
changed my mind later on. There was no objection. I made a
log for routes not on the list or not signed in the field. I want to go through that again with my today's experience soon.
and it does include both B102 and B403. If it doesn't matter whether a route is signed or not, they should be in.
I assume that B601 was dedicated (or even built) in the last 22 years. Nonetheless, it
is signed (and was since minimum 2009).
R36 and R36y are also not on the 2002 wegenwiki document but there is a
wegenwiki article. And they are signed (
R36y +
R36).
*I'm also often started with wikisara articles to find the route at all back then but later learned that they are often not confirmed by actual signposting in the field (GSV).