After driving the Reno business route of US 395 today, I am of the opinion that it no longer exists. Not only is it completely unsigned on the surface, it is impossible to drive the BR northbound due to a road diet in downtown Reno. The only evidence of the BR is a set of BGSes on US 395 at Exit 72, where the road does not have a local name. There is plenty of precedent for NDOT not removing shields/postmiles when they decommission routes, as evidenced by several former SRs in Carson City and Reno.
I propose deleting US395BusRen in entirety. The other routes that overlap with the BR still exist and are signed well.
For what it's worth, Corco is also of the opinion that it no longer exists given what is on the surface, and he's the one who insists everything be clinched if it exists on paper.