It's a total myth. Citadel's position taking in equities is correct on only 52% of earnings releases. Citadel's HFT has the correct deltas going into macro numbers around the same frequency too. I know many people in these firms and there is no such thing as predicting news.
You can probably find a dodgy small prop firm which is illegally doing it because they have insider contacts but there isn't a systematic ability among the big players to do it.
Only the main releases, NFP and the like or if your in oil supply / demand issues.
