Archer did nothing wrong
As an Archer fan… bwahaha. He knew it was wrong, there’s too much dialog around suspending moral codes and the like.
Eg one of my fave episodes Harbinger:
PHLOX: Captain, this man is dying a painful death. To keep him conscious is unethical.
ARCHER: Until I get the answers I need, we're going to have to bend a few ethics.
PHLOX: Very well, I'll do what I can.