Brian was making the reference to a value that is obviously too high for any good to result if your advice is followed. Strong artifacts and halos will ruin the image with that much sharpening.
There is a general consensus that a little sharpening is useful in creating an impression of finer detail and edge sharpness on the D7000, +1 or maybe +2, when viewing the rear display or JPGs on a computer screen. Few people have complained of lacking sharpness at those values.
So Brian's remark was right on point, it is not helpful to tell those who are new to the camera to use values that will result in poorer images than if they did no adjustments. Since each new model has come out, there are initial problems encountered with applying techniques and habits that were learned to improve images on prior models. A few new rules of thumb or habits will have to be learned. Brian has been through the initial learning curve with new owners for many models so he speaks from experience from helping thousands of people adapt to their new cameras.
Adaptability is probably the most useful personal trait in photography. It allows habits that do not apply any longer to be dropped and new beneficial habits to be absorbed. Some habits are model related and others are basic photographic principle based. Some early DSLRs lulled people into sloppy use, that they had to master in film. For example, film required higher shutter speeds generally than what we could get by with with D80s or D90s which are very forgiving cameras. The Matrix metering got many people thinking that active evaluation of the tone range of a scene was not needed anymore. The D7000 quickly reminded those who remembered film habits to increase shutter speed over what they were in the habit of using with lower res early digital cameras. Stan St Petersburg Russia