Unfortunately, I cannot create a summary of the requested article because the search results provided do not contain the content of the article titled "STAT+: UnitedHealth promised transparency. Instead, it's cutting back key disclosures". The search results only contain links to other UnitedHealth articles (Q4 2024 earnings information and 2026 warnings) and academic text on tax evasion that are not relevant to your query. In order to create an accurate and factual summary as per your requirements, I would need the full text of the STAT+ article you mentioned in the title.