Of course that attendance increase includes pass holders. Die-hards who rarely came to USH bought passes because of WWoHP. People who hadn't been in many years came out to see the new land. I suspect people who claim HP was a failure usually mean it didn't draw the same numbers in its first couple of months as HP in USO did.
This is true for us. We live a little more than an hour from the parks, its almost 2.5 in traffic. We have now had passes two years in a row because we enjoy WWoHP, and have all our Uniforms too (times 5 of us). We have at least 15 people that we've convinced to visit the park and who have AP's too. I'm pretty frugal when it comes to theme parks, but we have spent a lot more at Universal in 2 years then I ever did in 10 years as a Disney AP. I'm sure there are a lot more people like us.
(Swore up and down I wasn't spending $50 on a wand.....we have two and are going to get a third. Maybe a 4th),