OzRob
New member
Actually, I just got my Lumia 521 a week ago and followed the instructions at this link to sync multiple Google calendars, including shared calendars:
Set Up Multiple Calendars with Windows Phone - Google Apps Help
I had no problems setting this up.
I think it's also location specific. I'm in Australia. When I try to go directly to the sync setting pages detailed in the link you gave, it only takes me to some default info about setting up mobile apps. It doesn't take me to the settings page. As I said in my post, there are hacks to get around this, but it's not straightforward for everyone to set up multiple Google Calendars in WP8