Exactly. And heavy post-processing is necessary for even very simple things because a camera's sensors don't match the output picture all that well. See for example https://en.wikipedia.org/wiki/Bayer_filter#Demosaicing. The postprocessing has moved up the semantic stack and now cameras do things like face detection and smoothing, but there's always been some amount of postprocessing in digital photography.

What people are trying to say is that if this is your definition of post processing then there doesn't exist any digital camera system that produces photos without post processing. Indeed such a camera cannot exist.

I know, I work in digital image processing, and I'm an amateur astrophotographer. Demosaicing is not on the same level as star registration, stacking (posibly HDR processing in the middle), plus some more AI driven "magic" in between.

That's what I'm referring to: for the shown image "without post-processing" the phone has performed a lot more actions after demosaicing, that's why i say it was heaviliy processed.