No false advertising. You spoke and we listened!
The 10600 dpi number is the resolution of the sensor. The paragraph on this page that deals with image quality explains it a little further:
http://plustek.com/usa/products/opticfilm-series/opticfilm-120/introduction.html The 5300 dpi optical resolution was measured by LaserSoft Imaging using USAF 1951 test targets during their integration of the scanner.
We at Plustek thought it was important for the customer to understand exactly what they were getting so we decided to publish resolution and dynamic range test measurements rather than just theoretical maximum values.
I hear exactly what you are saying about what we owe to the consumer and I agree with you 100% This isn't an inexpensive piece of equipment and you need to know EXACTLY what it is you are buying. You also need to know that there are real live people that are standing behind the product, not just an importer.
A little more background on the OpticFilm 120 team: The Product Manager is an avid photographer (yes that is her Lubitel in the photos) that shoots more film than digital! This is a product that both she and I will use frequently.