Bullshit.
It's a photograph of an etching.
That's still a photgraph taken by the same unique photgraphic technique as the later photograph by the same photographer.
Lithographic printing is something different.
Quote:
Lithograph
Using a greasy crayon, the artist draws directly on a flat stone or specially prepared metal plate. The surface is then dampened and inked. The ink is repelled from the wet areas but sticks to the greasy areas, which are then transferred to paper.
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Clearly, it is not the earliest photograph of a horse, given that it is a photograph of an etching of a horse, not of a real horse, but it's still an earlier photograph.
A photograph of another art piece, whether it's an etching or a sculpture is still a photograph, not a print.
It's not a photocopy, either.