Based on my own personal experience at plenty of motorcycle dealers, I wouldn't have trouble believing that H-D dealers could be the best overall. Most of the dealers, particularly the Big 4, are pretty bad.
However, be careful what you believe when it comes to this type of "research." It looks to me that some of these measures have very little to do with customer satisfaction. Asking for contact information? Forwarding the sale? They've practically admitted that this survey is really about improving "sales processes." That may or may not have something to do with prospect or customer satisfaction. It may have more to do with sales techniques.
I can tell you that in at least two of the H-D dealers around here, the salespeople were fairly smug despite their obvious lack of product knowledge. A few were pushy and condescending, too. In one of the H-D stores, the salespeople were really nice and tried to be helpful but still had a tenuous grasp of the product.
And if you were looking for Buells, they practically ignored you. It could explain why at least two of the four local dealers no longer carry Buell.