Naah. I call BS. You know what you're implying.

TeChNicAlLy it sort of already existed. A diffusion model can only generate an impossibly huge but finite number of images, and the content of these images is determined when the model is created. So when you 'generate' images you're kinda just browsing a catalog

The "already existed" gives it away. No, this didn't "sort of already existed", and there is no technically correct interpretation that can give you the benefit of the doubt either.

content of these images is determined when the model is created

Nope. The diffusion model guides a random noise image. Mathematically, any image can be generated out of pure randomness without any effect by model. See how silly and uninteresting "technical correct" makes things?

So when you 'generate' images you're kinda just browsing a catalog

Nope.

It is OK to admit you were wrong. No need to double down on this. I just wanted to explain why it was wrong.