I think they just misspoke, but FX isn’t shy about letting their episodes run long either and I would also bet on an extended finale. Most People vs OJ episodes aired in a 1 hour block, but the premiere and finale were extended episodes and aired in a 1½ hour block.
This screener reaction for ACS Versace confirmed that episode 8 is the only one that runs over 1 hour so far. I think episode 9 will also run long, but probably for a 1½ hour block instead of 2.
