Thanks for the info, but of all the DMT Diamond Stone Videos they have not used anything like that.A slurry stone rubbed on the sharpening/polishing stone leaves a fine material, which is what actually does the cutting/polishing. Think of it like a cutting compound. I'm not sure if diamond stones require them, but I know many stones do require them to be rubbed with a slurry stone before use, so you actually have an abrasive to cut the blade.
Here is a video from the manufacture and I believe they can be used dry. I have the double sided with two different grits and they show the Whetstone™ in this video. There is another video with my stones, but I don’t have time to find it right now.
Ok I just found one video of the ones I have shown below.