Official comment
it looks like you're using the software in 64bit mode -- the Pioneer ASIO drivers are only available in 32bit mode. What you'll have to do is follow these instructions to get Traktor back to 32bit mode so the DDJ drivers will show-up:
1) Go to "C:\Program Files\Native Instruments\Traktor 2”. In this folder you will find the current 64-bit version of TRAKTOR PRO called “Traktor.exe”. Please rename this to “Traktor64.exe” so that you have a backup of this version.
2) Open the “x86” subfolder. You will find another “Traktor.exe” inside. This is the 32-bit version of TRAKTOR PRO. Please move or copy this application up one sub-folder to the "C:\Program Files\Native Instruments\Traktor 2” folder.
3) Now launch this newly copied “Traktor.exe” - this will now be the 32-bit version of TRAKTOR PRO.
You should now see the DDJ-SB ASIO available to configure your output routing.