Turn of the century (19th to 20th that is) technology in lenses, emulsions and lighting.
And slightly touched up to make it look good, and maybe a bit of dodge & burn.
Plus, it’s unlikely that the scans were made from the original photographic plates - if there were any negatives in the first place.
Scan from an original print would mean scan from a very old print. Depending on how it was stored, some grade of fading/deterioration overall, with the print’s emulsion behaving somewhat different from paints used for a touch up.
Scan from a photographic reproduction of an original print or scan from a reproduction in a book would add several levels of processing to the picture as it is now.
And please let’s not get into a philosophical argument whether any picture is a fake anyway because it’s not the thing it depicts.
