Anyway, in case that they didn’t tell Boeing in advance, a simple explanation would be that they couldn’t get exactly the same ingredients (e.g from the same supplier Rossi told IH), so they tried the best substitute and didn’t tell Boeing (exactly what they did) because it would reveal part of the IP of the fuel.
If your scenario is true, Rossi fans may still have some reason for hope. Yeah. That would mean Rossi either; never gave up the real formula, or IH could not get the exact ingredients Rossi used to make it work. And the story lives on.