Earlier quoted context omitted.
Personally coming from the film era, I don't think it's as clear cut as this. Many of the post-processing an informed person does on a digital photo is an emulation of a process rooted in a darkroom, yes. On the other hand, some of the things cameras automatically does, e.g.: Skin color homogenization, selective object sharpening, body "aesthetic" enhancements, hallucinating the text which the lens can't resolve, etc…
If a professional had access to darkroom facilities pretty much everything could be done in there right down to removing people and background objects (see for instance https://rarehistoricalphotos.com/stalin-photo-manipulation-1... ). It's just far easier for anyone to do now.
But you can't change a person's proportions and skin tones so precisely unless you're printing small and have time, equipment and talent to paint the positive (negative would be nigh impossible) in a believable manner to do so.
On the otter hand, you can enable slimming filter on your phone or camera, click and you go.
Oh, also, some of the Soviet photo manipulation is done with stolen and translated French software, in 1987 [0].
[0]: https://tech.slashdot.org/story/10/11/04/1821236/soviet-imag...