You really know your stuff regarding SE amps and high efficiency speakers.This sort of statement can be very misleading, and be misleading to many that don't know better.
As the Wilson Alexia has nearly identical efficiency to these Goldenear's, Stereophile measured the Alexia at 91.2db, but they have a very nasty impedance v -phase angle load. Even a very powerfull push pull tube will have a very hard time driving it, as for a 8w S.E.T.!! no chance in ****.
So one needs to look at lot more than "just efficiency", and learn to read impedance vs -phase angle graphs, which is even more important than efficiency all it's good for is to give you an idea how "loud" to can go, not how good the driving sound quality will be.
Cheers George