I've been around these kind of situations. What started as a hackathon project, where we had 1 bizdev, 1 health tech related person (non-coder/technical) and me, the programmer. There were a few flaws in the plan, both conceptual and technical needed to actually turn the concept into viable product. It seemed like raising VC funding was the "goal" more than creating a MVP for beta-launch and customer feedback.

My best advice is to be direct, and take care of yourself personally, especially physical and mental health.