Great question! The approach used in the study also used psychoeducation and breathing exercises as well and we’re in the early stages of an observational study into the Nerva program. What do you mean re discouraging users who’ve tried FODMAP?
Interestingly, it’s possible they both help with visceral hypersensitivity - FODMAPs ferment in your gut causing gas and your gut to expand and hypersensitive nerves could then be alerting the brain to potential (but false) danger, so by avoid FODMAPs you avoid this process. Hypnotherapy could potentially be coming at the same process but from the top down instead.
But certainly I don’t see it as a cause to exclude low fodmap people from trying the app.