This report synthesises findings from 8 peer-reviewed papers addressing the following research question: Does increasing the diversity of synthetic pretraining objectives reduce performance variance of tabular foundation models when evaluated on out-of-distribution subsets of TabBench. 10 claims were extracted from source literature; 10 were independently verified against retrieved documents. An automated multi-reviewer quality assessment produced a score of 8.5/10. This report is a machine-generated literature synthesis and does not constitute original research.Research goal: Does increasing the diversity of synthetic pretraining objectives reduce performance variance of tabular foundation models when evaluated on out-of-distribution subsets of TabBench?Autonomous literature synthesis. Automated review score: 8.5/10. Full text and citation available at Assignee Research.