we’re still feeding them “more data”.

Yes, that’s one way of putting it. What gets into the Adobe stock database is already curated. They also have the sales and tracking data.

Though as these generative models get better and better at mimicking real world data

Also yes on this. It doesn’t matter if your data is synthetic but only if it’s fit for purpose. That’s especially true in this case, where the distinction between synthetic and real is so unclear. You’re already including drawings, renders, photomanips, etc. I have no idea what kind of misconception people have that they would think it matters if some piece of digital art is AI generated.