Language models certainly generate their fair share of bullshit. But then, they are actually trained on bullshit - raw human output, much of it informal - so as a first step, it is a sign of great success.

By the time language models don't ever generate bullshit they will have succeeded in understanding and communicating at a level most or all of us will never achieve.

But most models, including photoshopping detection, are not language models. Their job is to perform some well defined problem (classification, pattern recognition, relationship generalization, etc.) better than alternative methods. They perform, or they don't. There isn't room for bullshit.