Seeing 8x10 contact prints from Ilford FP4+ shot with the 720 Nikkor Tele - the lens covers and the corners look fine. Image was combines in a wheat field from a hilltop more than 1/4 mile away.
Spec sheets and arguing don't change the reality that the lens (at least those Corran uses and the one I have seen prints from) covers 8x10.
Denying it works is like the religious types with "When you have faith, facts don't matter".
Corran and others have shown the lens works. Maybe some variation in specific lenses but enough are telling us they use this focal length successfully with 8x10 that there is no doubt about it.