This report synthesises findings from 7 peer-reviewed papers addressing the following research question: How does diversity-weighted retrieval in RAG pipelines affect FLAN-T5-xl robustness against syntactic perturbations on the HANS benchmark compared to standard dense retrieval. The rapid advancement of Large Language Models (LLMs) has driven their expanding application across various fields. One of the most promising applications is their role as evaluators based on natural language responses, referred to as ''LLMs-as-judges''. 11 claims were extracted from source literature; 11 were independently verified against retrieved documents. An automated multi-reviewer quality assessment produced a score of 8.2/10. This report is a machine-generated literature synthesis and does not constitute original research.Research goal: How does diversity-weighted retrieval in RAG pipelines affect FLAN-T5-xl robustness against syntactic perturbations on the HANS benchmark compared to standard dense retrieval?Autonomous literature synthesis. Automated review score: 8.2/10. Full text and citation available at Assignee Research.