Although it didn't reach as high a peak temperature as June 2021, you could make a legit claim that August 2023 was actually worse of a heatwave in Eugene with a 4-day average mean temperature of 84ยบ. By that metric, it was #1 all-time.
Station anomalies are based on their own long term records. Not sure what you're trying to get at here.
PDX currently runs warmer compared to its own records than just about any station in the region. That's the definition of outlier.