I haven't linked a new account in at least 3-4 years, but fortunately, the process has not changed.
I called in to link my Freedom Unlimited to a family member's new CSR. The phone rep was very knowledgeable and immediately asked if either my account or my family member's was already linked to another account. Neither was. He then asked for the surname and full account number, as well as how many points to transfer. I just asked to transfer 10 points as a test and it succeeded.
Hung up the phone and logged in to my account. Sure enough, I see my family member's CSR on the combined points page. Also the 10 point transfer under the transaction history.
So basically, nothing seems to have changed in 3-4 years and it's still easy to link a new account..