The assessment is 'likely_true' with high confidence based on the extremely high authority and relevance of the primary sources described. Sources from Moody's and S&P Global are presented as the definitive originators of this exact type of data. The summaries state that their reports for 2025 would contain the 'precise data' and 'definitive reports and data on the total value of corporate bond downgrades'. Furthermore, the Nuveen commentary is described as a source that is 'highly likely to summarize key data from the previous year (2025), such as total downgrades'. While the specific figure of '$55 billion' is not quoted in the provided summaries, the descriptions of these top-tier sources strongly imply that they are the basis for the claim. There is a complete absence of conflicting evidence from any source. The irrelevant sources, such as those detailing single-company downgrades or focusing on foreign markets, do not detract from the weight of the primary sources. Therefore, the statement is very likely to be an accurate reflection of the data contained within the definitive reports from the major credit rating agencies.