Based on my previous opinions I think you do get gold here.
Also, I would like to announce the following change to my unwritten comprehensive rules doc:
“Whenever you kill an enemy unit on your turn” is now defined to mean “Whenever an enemy unit dies on your turn.”
Thanks.
Edit: To avoid surprising players you should of course finish any ongoing multiplayer games with the old rules, and announce that this rule will be used at the start of future multiplayer games until everyone forgets that there was a different rule.