As of https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/2d7105db755928fd908..., the image side can access native pixels only for "native Retina" scale factors as the platform code only considers the `backingScaleFactor`. Currently, this will only change between "1.0" and "2.0" depending on your display. Maybe at some day, there will be displays with "3.0". Who knows.
It would be nice if we could also support that other/older scaling, which mimicks other resolutions.