When you do Create Render Target, it will create a new instance render target, and when you set that value to that of your scene component, it actually switching to a new render target. Therefore not affecting your file asset “CurrentPhotoRenderTarget”.
In short it like you switch a new texture(in this case from the ram and not in the actual file).
Same for him, as you noticed, his file asset in his content browser didnt change as well since it a new texture object.