I note that Tom and Ran modestly assigned The Loop a Doak 7 in the last version of The Confidential Guide, whereas Rock Creek, Pacific Dunes, and Ballyneal get 9s or 10s from the Guide reviewers. I'd say The Loop is a Doak 8, "worth a special trip to see," evidenced (at least) by Ally, Robin and Sean building a trip around it all the way from the UK, and your suggestion that it's a one of a kind course that plays fantastic. I would give the latter compliment to Ballyneal too.
Charlie and Ally,
Note that #4R is one of the better and fun-to-play Redans you'll find. If the tee was closer to #3R, or off to the right of that green it might be super-long Redan or a par 4 with a Redan-ish green--or you could build a different green! Maybe you'll play the back tee on each next time? My experience is the placement of that corridor is about ideal--both par 3s work well in the flow of both routes.
Charlie, note Tom's assignment was to build a walking-only course. The carts came ~2yrs after opening, unfortunately. You didn't say when you visited, but in 2021 the resort got GPS-enabled carts that can be programmed with "restricted areas" that helps keep yahoos away from the greens. Not pure walking, but better than carts with no restrictions.