I simply do not see how you can interpret "if they do not deny training on them, they can't deny plagiarism" as "all outputs are necessarily plagiarizations of

I simply do not see how you can interpret "if they do not deny training on them, they can't deny plagiarism" as "all outputs are necessarily plagiarizations of the training data". There is a difference between claiming an action is a transgression, and claiming it could be one.