I think that Lusche is trying to make this point:
Spit I in LWA: Deathtrap.
Spit XVI in LWA: Top line fighter.
He111H-6 in LWA: Deathtrap.
He111H-16 in LWA: Deathtrap.
Is the H-16 less of a deathtrap than the H-6? Yes, but not enough to be considered something other than a deathtrap. the H-16 would likely beat the G4M1's K/D ratio, but not much else. So whatever the changes to the Spit XVI compared to the Spit I, the effectiveness of those changes are much greater than any the He111 saw.