I highly doubt the OP of that thread actually wants to have the issue fixed. It looks more like he just wants to bash calibre. Especially since he has posted in the calibre forum before, he didn't want to bring up the issue here nor did he want to report the issue to us in any way.
Here is a response to this very issue from the developer that maintains the Kobo interface. He was able to reproduce this issue and provides instructions for fixing it. Even if this isn't the case for the OP, well he has shown he doesn't want the issue fixed.