https://manifold.markets/jack/will-biden-be-president-on-915-reso shows Volume: M$375,539. This is very incorrect, there were millions of M$ bet on this market. (I suspect the issue might have something to do with limit orders not being counted correctly.) The bulk of the investment was from @NinthCause who invested M$1,872,324 in the market. So that's a very easy lower bound on the volume.

Resolves YES if by end of 2023 the volume displayed on this market is corrected to at least M$1.8 million. Resolves NO otherwise.

(M$1.8 million is to allow for some degree of inaccuracy, it just has to be in the right ballpark, and this way I don't have to adjudicate cases where the calculation changes or figure out whether it's exactly correct.)

Update: Now that the author leaderboard no longer is based on trading volume, I removed part of the criteria that was no longer relevant. The original resolution criteria was as follows, and it is no longer relevant because of the next paragraph:

Resolves YES if by end of 2023 the volume displayed on this market is corrected to at least M$1.8 million, and the leaderboard for top creators also reflects this corrected value. Resolves NO otherwise.

Sep 28, 10:40pm: The intent is that the market volume stat on the market must be corrected and the leaderboard must use this corrected market volume stat if it uses the market volume stat at all. So e.g. if the market volume were corrected but the leaderboard were deleted entirely or the market were intentionally excluded from the leaderboard, that would resolve YES.