BrownAZ,
DLP Version 12 was released last year so SharePoint 2013 was not available to test the SharePoint plugin. So the plugin might actually work with DLP. Keep in mind that the plugin is what makes DLP able to scan it. So the plugin is the key piece to the puzzle.
I would try to install the plugin on SharePoint and see if it works. If not then uninstall the plugin.
Also keep in mind that Version 12.5 is coming in the next couple weeks (1st week of June), which might support 2013.
Hope this makes sense.
If this solves your questions please marked as solved.
Ronak