[Zapmeister]

So I entered it using that preexisting board alias. Stormbind, of course, would like to believe I was pumping him for information, unknown to him, on the chat....as if I'd actually care that much about his secret plans. If he had bothered to tell me anything substantive, I'd have even offered him suggestions on how to improve his play.

Hmm, I see (I think). If my understanding of the situation is correct then I would also regard the behaviour as unethical. Correct me (and I'll apologize) if I'm wrong:

1) You were in a game with Stormbinder in which you used some name "A"
2) You conversed about that game with Stormbinder using a different name "B"
3) Stormbinder had no way of knowing A=B and you would have been aware of that, and could easily have rectified it ("I'm Norfleet, BTW")

The claim that you would have helped him if he'd said anything substantive is irrelevant, because:

1) It is only your judgement at this point that nothing substantive was in fact said.
2) Even if you had offered help which may or may not have helped him, you would still have had knowledge which you could not avoid (even if subconsciously) considering in your game plans.

All of this could simply have been avoided by a declaration of your identity.
Again, my apologies if I've misunderstood the scenario.

Now, of course, he'd like to throw a hissy-fit over the matter, as if I was somehow wrong to enter a game under an alias. He calls this circumstances surrounding it "unethical", although nowhere in my ethical code does is this behavior mentioned as such.

Well, judging from your signature and other comments, I'd say your ethical code leaves out lots of things. Many people regard this kind of behaviour as dishonest, at the very least.