You can create classes to hold the information about them and keep it from interfering with the information about the background that you want to render them on top of, even though that is an artificial distinction in terms of the pictures you begin with, which are undifferentiated bitmaps.
The mkobjects routine to which he refers does indeed add apparently physical objects which do not exist, and is used to calibrate analysis routines.
The Calibration of the Hubble Space Telescope Kuiper Belt Object Search: Setting the Record Straight.
SO seems to "think", if such a word can be applied to what goes on inside his head, that:
1. A routine to add objects to images exists.
2. That routine was used to add some objects to some images to calibrate the analysis routines.
3. Therefore, all objects in all astronomical images, electronically processed or not, are faked.
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