Amazon's Kindle Paperwhite is seeing shipment delays as a result of the product's supply chain. Because the device's raw materials and production labor are in shortage, its production capacity is lower than expected; however, Amazon is reportedly working on the issues and will be able to meet year-end demand, according to Taiwan-based supply chain makers.
My guess is that Amazon' s specific problem has to do with the screen and frontlight assembly for the Kindle Paperwhite. This ereader uses the new HD E-ink screen developed by LG Display, and the process for attaching the frontlight might not have all the bugs worked out.
On the other hand, Digitimes could simply be repeating that older story and inventing a supporting detail. They've been wrong quite often before.
In any case, Amazon is still promising to ship the KPW the week of 22 October. That's 3 weeks behind the original ship date as well as a week behind my ship date. But that delay has held steady for the past few weeks, so I'm betting that Amazon believes they have solved any supply issues they might have been having.