The Short Version
No credible source supports the claim that M. K. Stalin promised a 5% pension rise for Tamil Nadu Government pensioners in the 2021 Assembly election manifesto. Multiple authoritative outlets consistently report that the DMK's 2021 manifesto pension pledge was to restore the Old Pension Scheme, with the only percentage-based promise being a 10% additional pension for those above 70 years of age. The specific "5% rise" figure appears entirely fabricated.