While true (I got a response on the original blog from the author that makes me feel confident that he is, in fact, not being paid the 20%; Britta also managed to find a few other reports of people not being paid), the reason I deleted it was simply that I realized that the first half assumed the 0% was vs. the 30%, but the later "to me" paragraph decided that the 0% was likely for the promotion, which meant that the entire comment was confusing and I realized I was just making things worse by posting it.
So, as you removed it, do you no longer believe that Amazon may still honour the 20%?