Ah, it's based on this repo [0] and there's only 1 non-example submission there [1], from 2 weeks ago (so it only covers the preview games), and their schema doesn't a field to show that it's only the preview, nor does the thing properly parse the score or cost into the table. And the biggest thing is that apparently there's no validation whatsoever - submissions are not ever run on the hidden test games, so is essentially useless as a comparison.
[0] https://github.com/arcprize/ARC-AGI-Community-Leaderboard [1] https://github.com/arcprize/ARC-AGI-Community-Leaderboard/bl...