No it really doesn't...
Think about the mechanics of it,exactly...all you are doing is gluing an extra piece on the bottom of the neck,and then taking away the same amount of wood from the neck pocket...but it is exactly the same as if you just left the wood off the neck and routed a regular pocket..
No difference...you still have the same dimensions of the primary neck pocket,which is the three glue lines you hit first..the two on the sides and the one at the bottom of the neck itself...
it also depends on the body's neck heel. There are many factors in joint stregth, not just the shape of the tenon.
Rhoads' technique involved an extension into the pickup cavity, which is why I suppose it would be stronger.