Roast meat should always rest after cooking but I wouldn't leave it in the turned off oven as there will be too much residual heat in there. Put it on the side covered with a tent of foil.
That's the actual method to this style of cooking.
High heat for a short time, then the "residual heat" finishes it off. No need to rest as the heat has been winding down as it cooks.
Here you go Food Wishes Video Recipes: Perfect Prime Rib of Beef with the Mysterious "Method X"
I haven't used LP's guy's method, but I've used this one with excellent results.