The confusion is because there was a change in policy a while ago.
For many years, new members did not have to pay closing on their initial contracts. That has changed, and you will pay closing on your purchase whether you buy through Disney or resale...though I think Disney does absorb part of it, so it is a reduced cost vs. resale.
After you are a member, there currently are no closing costs if you wish to add-on to your membership through Disney.