If your claim is true, that lends credence to the OP flavor containing truth as well. Even though it’s an asterisk short, “secreting away the **** extin******?” certainly does look like “fire extinguisher”.

Here is adalia’s original letter:
If you are reading this, I have likely been ******* ****. Traitorous scum, scum here! And cops, and two *******, though one is a nov*** and the other *****. And vanilla! Also, chocolate! And ask yourself, why is * so jealously secreting away the **** extin******? It makes no sense! Help us, *bi-Wan, you’re our only hope! Somebody’s poisoned the waterhole!

Here is Bookwyrm's solution:
"If you are reading this, I have likely been fatally dead. Traitorous scum, scum here! And cops, and two doctors, though one is a novice and the other crazy. And vanilla! Also, chocolate! And ask yourself, why is I so jealously secreting away the fire extinguishe? It makes no sense! Help us, Abi-Wan, you’re our only hope! Somebody’s poisoned the waterhole!"

The asterisk in “why is * so jealously...” is possibly an initial. “Novice” seems pretty reasonable. “Doctors” and “crazy” both work in the context, but other roles and adjectives will work as well. “Doctors” is probably the most common role that fits. “Fatally dead” sounds odd, one or both of those words probable needs tweaking – the idea is probably the same.

Abi-Wan - I haven’t seen the neweset Star Wars yet, is this a new character? Otherwise, I wouldn’t trust Bookwyrm’s ability to recall Star War’s trivia. :-p

What does “And vanilla! Also, chocolate!” mean? bler mentioned in the sign-up thread that no-one would be pure-vanilla. Perhaps it refers to that?

It’s kind of fun to ponder, however, I don’t think we should put too much stock in this yet. The coming days should help us determine whether this is pure flavor or not.