To accurately answer your question regarding which inference would be invalid concerning the expert from the article "How Nelly Went Undercover to Expose Abuse from the Mentally Ill," I would need to know the specific details of the article or the conclusions drawn by the expert within it.
However, generally, when evaluating inferences about an expert, consider the following criteria that might lead to an invalid inference:
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Generalization: If the expert's findings are being generalized to all cases of mental illness or all institutional settings without sufficient evidence, that would be an invalid inference.
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Overlooking Context: If one infers that the expert's conclusions apply universally without considering the specific context (e.g., specific facilities, types of mental illness), that could be invalid.
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Conflating Expertise: Assuming that the expert's opinions on one issue translate into authority on a different but related subject without basis could be an invalid inference.
If you have specific proposed inferences in mind or if you can provide more context from the article, I can give a more targeted response!