Surely "honour" is a matter of Law vs. Chaos, rather than Good vs. Evil (Ethics vs Morality if I've got that the right way round)
Yes, exactly. Which is why it is not a surprising stance coming from EGG... Remember that in the earliest versions of EGG's D&D alignment was a single Lawful-Neutral-Chaotic axis, with Law == Good and Chaos == Evil.
Death Attacks can be deeply moral - in the same way that using a scout-sniper to take out the commanding officer of the opposing force (thus destroying their moral and encouraging their surrender and saving life) can be a Just act
Oh, I'm not necessarily arguing with you here...
In fact, I've long had a character concept for a Iajistu-style honorable knight, who studies his foe's fighting style intently for weaknesses, before drawing his sword and killing his enemy with a single well-placed blow.
He'd essentially be a very lawful, but non-evil version of an assassin. Unfortunately, I can't yet create him the way I want to without a DM house-rule, due to the Evil prerequisite of the Assassin PrC.
If we were playing Iron Heroes, the concept would be perfect for an Executioner.