photoshop - How can I use CMYK values to white balance skin?

I recently heard a photographer mention that they:

...adjusted the white balance using the CMYK method

I did a bit of searching on this and found different resources claiming to use formulas such as C+M+Y = 5 * K or that you need to have a certain percentage of each to have proper skin tones.

I'm more familiar with simply adjusting the white balance in Adobe Lightroom using the dropper tool on a grey or neutral part of the image. How would I adjust the white balance by the CMYK method properly in Photoshop(I am assuming you can't use this method in Lightroom)?