If, during the trial, the judge thinks that OpenAI is going to be found to be in violation, he can order all of OpenAIs computer equipment be impounded. If OpenAI is found to be in violation, he can then order permanent destruction of the models and OpenAI would have to start over from scratch in a manner that doesn't violate the law.
Whether you call that "core" or not, OpenAI cannot afford to lose these parts that are left of this lawsuit.