TFW does say there is an opportunity for reduced noise. However, conventional turboprops are very loud compared to their jet counterparts.

Each revolution of a prop blade sends out a shockwave of air against the airframe. The strength of the shockwave is likely proportional to the instantaneous thrust of the engine, and more blades are likely to weaken or smooth it.

A turbofan has a nacelle to contain the shockwave, and avoid the whole noisy mess.

It's only discussed in a similarly ambiguous way - like that they know noise is a potential problem that they're working on. Though to be fair, the designers probably have no idea themselves, since apparently nobody has built a prototype engine that could be run at the rated thrust level in a way they could check the real-world noise and vibration on.

It was glossed over and buried.

It's quite difficult to make trains work over water.

Thank you for the clarification!