Comment by cma

Depending on details of the rasterizer, at the lower resolution bits of those can still show up at the same rate, just with more frames not catching any of them.

If it's just one pixel of it showing up, when it is picked up it is likely overrepresented, so may represent a loss rather than a gain relative to the baseline where it perfectly supersampled it would say show up with 0.1% intensity.

The all black frames may be more accurate relative to baseline than the ones that pick it up with much stronger intensity.

If the feature perfectly supersampled would show up with 50.1% intensity the frames with it may be more accurate than the frames without it, but now it will be more common.