Anomaly score should really be 1-S(t) (i.e. 1 - normalized PSNR)?

[kb1ooo]

In the paper the "anomaly score" is defined as the normalized PSNR, denoted $S(t)$ in the paper, and calculated as such in the code.
However, higher PSNR means more "normal", so shouldn't the anomaly score be $1-S(t)$, which I believe is what is shown in the example animation and labeled as "anomaly score"?