From my personal understanding, the code is really replicated there, and the NVidias Eula are not even distributed, which is wrong. My understanding is that NVidia’s code can be used inside a product as binary form and be even sold, but in source format it can’t be sold, meaning it cannot appear inside Unreal Engine Marketplace as a plugin format.
I am consulting with other people about , that are more competent in copyright than me. As soon more info comes, I will post later.