B737, I think you may have read it wrong .The a/p is not allowed to be used for app,meaning the a/p the same side with the failed RA. You may use the other one,no restriction for that.
We have the same info,and this is the way we understand it.
So,left RA u/s ,you should use only the right A/P for the app,CAT I only.
Also,for CAT II or III we have to do only autoland- so no CAT II or III availability with one RA u/s.