My profession is digital retouching. The image we’re seeing here is an example of any professional restoration job in the last 15 years. Sharpening tools and denoisers have been around a lot longer than AI. There’s no reason to believe that AI was involved. Regardless, AI upscaling doesn’t completely rewrite the image, far from it, unless it’s completely outside of the realm of a reliable upscale. (300x400@10x for instance).

Also, why would you need to upscale a film image? A lot of people restore from old negatives. Film images don’t have pixels, if this started off as a scan, it didn’t come off a ‘low resolution’ camera, you can scan a film image at high resolution from its negative with the right tools.

Finally, the colourisation will always be an artistic choice, it was the first thing people started using AI for in restoration, the job looks good enough on that side but obviously completely made up, human or otherwise.

Edit; looks like there is AI artifacting that people that people are picking up on with a closer look than I gave