> If you really want to reduce the unsafe keyword from being seen in most regular code, you create and interface that maps the C++ function and exposes it as a rust function, and you've hidden away your unsafe usage to one spot per function.

Isn't that what they did? Through the use of https://github.com/dtolnay/cxx

Agreed the article expressed the concern in a rather clumsy manner, but they seem to have a point for their particular use case, and they addressed it appropriately.