Your link is not going to the thread.You need a software update.
Whether you have Navigation or not determines whether you can upgrade yourself or need the dealership to do it. Long thread but worth the read. Maybe start from the end and go backwards, you'll find instructions for what you do if you have Nav.
I did it and it fixed my radio preset issue.
Well I spoke to soon. The day my satellite radio free trial expired all of my AM and FM radio presets disappeared. The XM presets were still there, though. ><I have a Premium with no Nav (thanks Google/Waze) and had this problem a lot at first. Now it's been about a month without any issues and I never updated at the dealer. It's like alchemy with these things sometimes...