John is a portfolio manager for an institutional investment fund. Over the past year, he has been focusing on generating alpha through active management. In the last quarter, he made significant changes in asset allocation based on macroeconomic forecasts, which resulted in a sharp increase in the fund's overall performance. However, the market experienced high volatility, with various indices fluctuating significantly as economic data was released.
At a recent performance appraisal meeting, John presented the quarterly results indicating that his fund outperformed its benchmark by 250 basis points. However, upon further analysis, it was revealed that a substantial portion of this outperformance was due to sector allocation decisions during a specific economic event that temporarily inflated returns. John's superior performance metrics include a Sharpe ratio of 1.5, a Treynor ratio of 0.8, and an attribution analysis showing a significant contribution from stock selection.
Considering the information about John's performance and the methods used for appraisal, which of the following conclusions about his performance appraisal is the most accurate?