Welcome to BT hootie.
If you keep your rh below 50%, you won’t have mold. I’ve found exactly one surface that won’t grow mold: boat hull paint. Don’t need it in my underground concrete houses.
Double check that fire resistance claim.
You might want to check in with spaceman, though he isn’t in Houston: http://www.starship-enterprises.net/Papercrete/index.html
Surely you know that stick framing doesn’t prevent mold.
PAHS works. Bury it.