The Short Version
No credible scientific authority claims peer review guarantees the accuracy of published findings. Multiple high-authority sources confirm that peer review is a valuable but fallible quality-control mechanism — reviewers cannot verify raw data, bias and inconsistency are well-documented, and flawed studies regularly pass review, as evidenced by post-publication retractions. Even Elsevier, the strongest source cited in support, explicitly acknowledges limitations and describes peer review only as the best available method, not an error-proof one.