A decrease in short interest typically suggests that investors are less bearish on a stock, which could lead to a potential increase in its price in the short term. However, the fact that SunPower's short interest is still significantly higher than its peers' average indicates that the market may still have some concerns about the stock. The impact score is positive, reflecting the potential for a bullish sentiment, but with moderate confidence and importance due to the mixed signals from the high absolute level of short interest.