More important than those FINRA figures for the shorts of the day is the short interest outstanding, because that represents the shares sold short that remain "naked" past the settlement date and will have to be purchased to cover in the future. When short interest is high, and the stock gets good news to push up PPS, the classic "Short squeeze" situation exists, where the shorters become frantic to buy their covering shares before the price goes up further and they lose more $$.
There are other boards on iHub who try to play these situations by locking down the float ("FLD" play) when significant short interest exists in a stock, pushing up the PPS and forcing the shorties to pay exorbitantly for their cover shares. It's a risky business but can pay well.