An AIC cannot be superseded by a FAQ and associated answer on a website. The AIC is an authoritative document and if valid still applies. In any case, this FAQ has nothing to do with the removal of the Single Seat restriction. It simply says that if you haven't completed the hour with an instructor for revalidation by experience, the rating will be restricted to single seat. If you subsequently want to remove that restriction you will have to comply with the AIC.
i.e. Complete the 1 hour with an Instructor and get the rating re-signed by an examiner to remove the restriction.
If you have failed to meet all the requirements for revalidation by experience you will have to do a GST