So, it transpires this is an old (2008) article resurfaced.
Old PETA Campaign Linking Milk to Autism Has People Outraged
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A spokesperson for PETA told The Mighty:
This is an old campaign that is still on our website because we have heard from people who have said it contains helpful information. Many families have found that a dairy-free diet can help children with autism, and since the consumption of dairy products has been linked to asthma, constipation, recurrent ear infections, iron deficiency, anemia, and even cancer, dumping dairy is a healthy choice that everyone can make.
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… so that’s alright then. The article stands because anecdotally milk causes cancer.
**** me gently with a chainsaw.