I can see where your mind's at, and your answer is correct, but the corresponding math is not. You quoted the S/C rpm; this thread is talking about the idler pulley rpm.

The answer is correct because the Code3 pulley approach is independent of this issue, as it maintains the stock crank pulley, stock idler pullies, etc. So, if you have the C3P S/C pulley and have your stock idler fail, presumably it would've failed anyway.

From BrianBrave's math and Jerry's post, sounds like this is a bearing issue - the bearing spec'd by LET and others isn't rated to handle the rpms; a higher-rpm compliant bearing needs to be spec'd.