Hmmmmmmmmm. Did you click on the link and understand what the author is saying ?
Yup.
What the author is trying to get at -
1) You can still shoot with a scratched lens, albeit adjusting where you want the main subject to be. Then you crop the pictures.
2) At most , the pictures taken show no sign of the scratch on the lens, but with a higher magnification, the "white spots" caused by the scratches will be more obvious.
3) A very badly scratched lens will not take good pictures anymore as on a higher magnification, the pic. sucks!