Yes this wharf has several issues. The building is an event space (https://www.thewharf.co.nz/), and as far as I know not a public part of the ferry terminal. The ferry terminal (node at the end of the wharf) is currently closed pending renewal, so the ferry route should be updated accordingly.  
https://at.govt.nz/about-us/news-events/northcote-point-wharf-renewal-works-about-to-start/