Could it be a typo, i.e. that adblock plus charges (money) for allowing people's amazon refs through the filter?
Although if you check exceptionrules.txt there are only 3 domains that have amazon links whitelisted.
EDIT: apparently the 2nd page of the article writes about the possibility of changing links.
It's not a typo. Here is a manual translation of the paragraph containing the allegation:
Schaut man sich den Quellcode von Adblock Plus an, dann stolpert man ueber die “typoRules.js”" welche Vertipper in der Adresszeile des Browsers ueber eine dann nachgeladene Datei http://urlfixer.org/download/rules.json korrigiert. Den Spass gibt es uebrigens auch als separates Add-On http://urlfixer.org, ebenfalls vom feinen Herrn Palant!
Und jetzt anschnallen, denn dabei werden fuer alle internationalen Amazon-Shops automatisch die eigenen Amazon-IDs angehaengt!
"If you take a look into Adblock Plus' source code, you will trip over a "typoRules.js", which corrects typos made in your browsers' URL bar with the help of the subsequently loaded file http://urlfixer.org/download/rules.json. By the way, you can obtain this funny little gadget as a standalone add-on from http://urlfixer.org as well, from the same honorable Mr. Palant!
Now fasten your seatbelts, because this automatically adds their own Amazon IDs for all international Amazon shops!
EDIT: apparently the 2nd page of the article writes about the possibility of changing links.