I cannot create a summary of the requested article because the full text of the article titled "STAT+: The FDA's Moderna pirouette is one more sign of chaos at the agency" is not found in the search results provided. The search results only contain information about FDA approval of updated COVID-19 mRNA vaccines, but not the content of the specific STAT+ article you requested to be summarized. In order to create an accurate and factual summary according to your requirements, I would need the full text of the article in question.