Source: The LBP2 Scoreboards will return tomorrow! - LittleBigWorkshop
Quoting: "I'm very happy to tell you that at 9:00am UK Time tomorrow (Wednesday 26th October), the servers will go offline for a few hours, and when they come back up the LBP2 scoreboards will once again work, hurrah!"
Finally, after 4 months of waiting, the platinum will be achievable again. They worked very slow fixing this.