So yeah, they need more OS developers. But who is willing to work under a strict NDA for almost no money? Close to nobody.
Close to nobody, perhaps. But I, for one, have reached out and offered to help under precisely those conditions. The Amiga was once very special to me, and I think it would be cool to work on the OS now that I have 20 years of experience developing for mainstream commercial platforms. It wouldn't be about money or glory. Just fun!