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The contacts listed on that page aren't even in my phonebook.

It seems like that page only lists the numbers from people who willingly shared their number if you canceled out of the import feature after installing the facebook app on your phone.

No - they also take phone numbers from your phone and upload them to Facebook (if you use a mobile Facebook app).

Not "if you use a mobile Facebook app", more like "If you said yes to some option that allows them to do this". I've had the Facebook app on all my phones the past few years (1 java, 5 android, 1 symbian), and yet I have no phone contacts here.

You're wrong, it's actually a copy of the contacts stored on your phone. On my account, the local pizza place and haircutters are listed, which definitively do not have facebook user profiles.

Only if you imported your contacts. That list was only my friends on Facebook who put their numbers on Facebook. Most of them are not in my address book.