I claim neither to understand it correctly, nor to have a particularly satisfactory explanation on how to use it 
However, for dehazing I like what I get using the “low” method with a smaller radius and a larger contrast value. Here’s an example, I hope it can be of help.
(Besides retinex, I did some final tweaks with contrast by detail level and the ‘V’ curve of the HSV equalizer)
_DSC4138.NEF.pp3 (10.5 KB)