Even a camera obscura with a strip of film inside contains some adjustment to the "actual" image. If I expose the film for longer/shorter or during differing weather conditions, or near a train, etc, the developed film is going to have an appearance that may tinge the viewers perception of the subject. A short exposure, slightly off tilt, during a partially cloudy day, and a 'proper' exposure, rightly aligned, during full sun at noon, both of the same subject, both taken as soon as the photographer could to meet the deadline, both published on the front page of a newpaper, will give readers wildly different tastes for the subject.
Even two different b/w films will have different brightness/contrast etc, and the color films vary even more, with some punching various red/blue/green levels.
That's all without necessary deliberate intervention of the photographer. Once you get in to artistic license, you've got an even wider range. Taken from a low angle to add gravitas, taken from a high angle to minimize chin and highlight chest, with special lights to deepen shadows, with/without normal/stage makeup to add anything from regality to poverty. Taken in one's very nicest clothing, with family that is never around, while everyone has a congenial expression. (Aww, look at this lovely family)(look at the grand barren desert monument off in the wild dunes that is clearly not littered with tourists and a short walk from downtown cairo) This is easily noticeable if you've seen both a wedding and it's final professional photos. The lights didn't look like that. Where'd the audience around their first dance go? Holy shit, she looked good, but not that good.
Many have often taken photography as if it offers a genuine view of a thing at a time. We even sometimes call historical representations "snapshots". But it's never been the case.
Not sure I'd really call any photo a fake per se, they're all just representations. I suppose the fakeness comes from outside the image: the framing. If one edits a picture of a park and says "come to Always Sunny Perfect Awesomeville Where it Never Rains and is Always Full of Butterflies", then one has lied as it definitely rains there and there's certainly not always butterflies. One producing a deepfake is doing the same: capturing something they'd like captured. If it is represented as a photograph, then, sure, there's a lie; there was no photograph. But both the image with the clothes on (with lighting, editting, and makeup) and without are the same "here's what I thought it should look like" rather than "here's an exact transcript of the actual arrangement of this particular band of the electromagnetic spectrum that would have met my eye at the time"