This seems different. With a knife the stabbing is done by the human. That would be akin to a paintbrush or camera or something being used to create CSAM.

Here you have a model that is actually creating the CSAM.

It seems more similar to a robot that is told to go kill someone and does so. Sure, someone told the robot to do something, but the creators of the robot really should have to put some safeguards to prevent it.