Data for Rendering Loss

Hello, appreciated for your rendering code!
I have a question about render loss mentioned in your paper. In my opinion, rendering loss needs a paired gt data rendered by nvdiffrast under the same light condition, whereas all the rendering code uses blender as the rendering engine. Am I wrong? Or this part of code has not been released?
Additionally, I'm not sure whether nvidiffrast can render a mesh with its bump map. If not, how to dispose this domain gap?