I'm not an expert at quantifying the magnitude of how bad that is, but revision down is not something "exceptional". The numbers have been revised down consistently since ~2022: https://www.nytimes.com/2026/03/06/business/economy/economy-...
It looks to me like a failure of the American media landscape, that such constant revisal trends are not called out in the reporting of new numbers. That just makes them a mouthpiece of the government.