Why not? I am pretty sure there is no training data of “whales playing the guitar”, but if you ask a model to draw one, it will do a respectable job of imagining that scenario.
If it is trained on well-tagged images of adult men and women both clothed and unclothed, and clothed children (not that all pictures of unclothed children are CSAM to start with), understanding the relation of clothed to unclothed appearance could allow a model to reasonably generalize unclothed child bodies.
Further, models that are otherwise well trained with a mix of photographic and drawn content can often generalize specific concepts for which their training only includes examples from drawn content to photorealistic imagery involving that concept.
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