As best I can tell, the author is saying that it's unrealistic to expect that a vibecoded photoshop would YET exist since just because you can use AI to help doesn't make the task much easier or quicker. If this is the right take, then I guess he's really talking about AI-assisted development (i.e. AI coding used as a tool by a human developer), rather than "vibe coding" in the sense of "here's some specs - write this for me". With AI as a coding tool, then all the hard work is still left to the human - coding it up once you've specced and designed it was never the hard part.
With Karpathy-style vibe coding - just tell the AI what you want it to build - it's either going to succeed fast or fail fast, so "where is the vibecoded Photoshop" is then a reasonable question, albeit a rhetorical one, reflecting that this type of "gimme X" vibecoding isn't able to produce something of that nature, so of course if doesn't exist.