Hi there,
I am responsible for the referenced GitHub project. Just to clarify...
We are researchers and with this project I provide easy access to our research tools for a wider "audience" (open science). The core is the openMHA.org software platform which we use for our research.
To be very clear: The mobile hearing aid prototype is a research tool, it is no product.
We base it on the Raspberry Pi because there we have almost the computational power and flexibility as on our PCs, including running Matlab script with GNU/Octave. And many researchers work with Matlab. Hence, this allows us to test new approaches rapidly in real environments.
I would encourage any technically skilled person (engineers, physicists, mathematicians, ...) to play with our toy hearing aid to understand and possibly solve the challenges of hearing aids.
However, if you look for a hearing aid that you can use, you should not use our prototype.
Best regards,
Marc