Yes, that's correct. Any Ruger No. 1 that is chambered for a calibre that produces less energy than 10,000 joules is not going to be prohibited either by the current regulations or by the proposed schedule.
As I've said before, there are other reasons that a firearm can become prohibited. If someone had a Ruger No. 1 with a sawed-off barrel, it could be prohibited for that reason. Generally speaking, Ruger No. 1 rifles that are not chambered in high-energy calibres will be non-restricted.