Relative to itself against an immovable object? Almost certainly. There are new tests (small offset, etc) that the LR3/4 was never designed for.
Relative to other vehicles on the road? Maybe. Probably. But I would not bet the house on it for all tests.
VW Touareg up to 2009 was one of the best built for crashes vehicle with it's solid chassis but also egg shape for easy roll over force deflection. Boxy things like an older Disco 1/2 older range rovers, jeeps, even the incredible mercedes G don't do so well in rollovers due to the A pillar getting so much crunch force, they collapse inward while an egg shape just rolls on over again.
My biggest things to look at on tests is the side intrusion of tree or vehicle and knee area intrusion.
It would be interesting to see a true test done with and without the best sliders we have on the lr3/4. Mine are probably the most ********* of any of them though one company pretty much tries to copy them. The "Rover Specialties" guys went so overboard, 100 lbs each side, but they are super stout and the integration to all available mounting points is solid. Aside from any bolts though the wrap-up shape against the sill does the brunt of the work in a crash.
These would spread an impact across the whole length of the sill so it really would be cool to see an NTHSA? test.