Is it really a single moment in time? It seems to me that conversations like this on photo forums always fall back to the underlying assumption that there is an inherent "truth" in a photograph because it is a scientific capture of exact data. We then always fall back on the position that a photograph captures the absolute truth of an object and that is the defining property of a photo, because we desire that it is so. We want photography to be about truth and science because we find it easier to form a rational understanding if we shoehorn it into our own rational framework.
But is that really true?
As John Sloan has often said, there is no truth in an object. What he means is that we can only ever see the world from a single point in space at any one time and because we can only ever see it through human perception we can never actually see the "truth" of the data. It is always modified. If we look further:
But that is not what the sensor saw. In fact it is so far removed from that data as to make the statement nonsense Yet we do not see it as nonsense because we desire there to be a truth in the data as part of our rationalisation of photography. This is the data on the screen, there is no inherent "truth" in it:

The image is a resized jpeg on a computer screen, there is nothing in either the resolution, (resized by algorithms calibrated to human vision) or the actual colour (the actual wavelengths of light transmitted by the screen) that relates directly to the data the camera saw. It is an illusion that's calibrated entirely to fool the eye that it is seeing a real object. From the focus of light, through the capture of information to the display of the photograph, none of the process is at all about capturing the actual true scientific data that defines an object, it is simply about creating an image that looks real to the human eye. As the human cognitive function always prevents you from seeing the absolute data defining the photograph with reference to the absolute data of actual light reflected/captured/displayed seems to miss the point and mis-understand photography. Even the best of the best lenses are defined by the humna eye and visual comparision even theough we still use numbers to rationalise those choices.
So back to your statement quoted above, What about early photography? Early views of the empty streets of Paris (there are some of Notre Dame that I am thinking of), shot with such slow film that the people become invisible. A single moment in time? Where is the "truth" in the scene?
We have always tried to relate a photograph to the truth, but it remains and always has been simply an image that has been created by the photographic process. As that process evolves so the definition of what constitutes a photograph must also evolve. And the one thing about photography that is becomming increasingly obvious with digital and the onset of AI is that you can't blindly believe there is a "truth" in a photo. Perhaps it's always been this way?