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The Dain-App basically detects a scene change and simply skip the interpolation of that frame.

Ahh, I did select to skip frames between scenes. Is it not the same function as Skipping the scene change in DAIN-App?

Can I know why is the audio output of the interpolated video not sync up? Like the audio is slower than the video itself, or the video is kinda stretched in a way? How can I fix this?

Windows does show the GPU usage if you are using it correctly. Open task manager, go to performance then GPU 1 and click the down-arrow beside Copy. Then select CUDA and now you will see your GPU is actually working.