It looks to be discussing old information shared a lot back in January about a study on SARS from 2012:
Immunization With SARS Coronavirus Vaccines Leads to Pulmonary Immunopathology on Challenge With the SARS Virus - PubMed
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Also links to an October 2020 study regarding informed consent:
Informed consent disclosure to vaccine trial subjects of risk of COVID-19 vaccines worsening clinical disease - Cardozo - - International Journal of Clinical Practice - Wiley Online Library
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Informed consent disclosure to vaccine trial subjects of risk of COVID-19 vaccines worsening clinical disease - PubMed
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Informed consent disclosure to vaccine trial subjects of risk of COVID-19 vaccines worsening clinical disease - US National Library of Medicine National Institutes of Health
(post is archived)