here is a passage from FINRA. org with the applicable link. It appears to me that they are actual short sales applicable to that particular date.
"Daily Short Sale Volume File
The Daily Short Sale Volume File will provide daily access to the aggregate volume of short sales in NMS Stocks and OTC Equity Securities reported to a consolidated tape and traded over-the-counter during regular trading hours on each trading day. FINRA will post the Daily Short Sale Volume File within a reasonable amount of time after the end of regular trading hours on each trading day. Specifically, the Daily Short Sale Volume File will include the following:
trade date; trading symbol; aggregate reported share volume of executed short sale trades during regular trading hours; aggregate reported share volume of all executed trades during regular trading hours; and market identifier."
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