Hmm, no reply for a week. Yet, this is of substantial interest. Openstreetmap is not a paint book where ways are given colours by the mappers. Instead, mappers map what is there on the ground (a.k.a. trampling).

I guess I will have to change the tagging of the way from highway=path;path=route into highway=route. This tag is not widely used. Which colour it renders just up to the consumer of the data. Looking at the way in the tracestack topo renderer, currently it is shown red. And that has been said is not wanted.