The claim is materially supported by the directly fetched X post at https://x.com/KobeissiLetter/status/2046249027461615877, which explicitly gives the two key figures: about -$2.0 billion in April outflows and about +$6.0 billion in February inflows, and says this is the largest flow swing since inception. Additional search evidence from 'S&P 500 Equal Weight ETF outflow April 2026: Market rotation alert' and 'Investors Ditch Growth for Value ETFs in February - Morningstar' is consistent with those numbers. However, confidence is limited because no official Invesco page, exchange filing, or directly fetched fund-flow database page was successfully retrieved in this run to independently verify the exact amounts and the 'largest monthly outflow on record' characterization.