The SteamPeaks account does not own WP10 世界のレジェンドホース 購入権フルセット 全１０頭, so no manifest of it has been read and there is no size to measure. The Depots section shows the sizes Steam reports for each depot; the history starts the day a free licence or a key adds the game to the account.
No silent builds: every build of WP10 世界のレジェンドホース 購入権フルセット 全１０頭 on an unprotected branch in the last 60 days had a patch note or an update event within a day of it, is under 24 hours old, or has not been judged yet. The hourly check fills this in.
The SteamPeaks account does not own WP10 世界のレジェンドホース 購入権フルセット 全１０頭, so none of its files are in the index and nothing can be compared until a licence adds it. 1,412 games are indexed today.