Can't tell you what it means, but I can tell you how it works on my set. I have color and tint, and (if I choose to use them) individual "color management" settings for RGB and CMY which are phase and gain.
With "color management" turned off, I use color and tint to even out the color and tint test pattern of getgray with the blue filter from DVE. I adjust that so that all the blues are basically equal, and it's quite close (at least from a visual standpoint).
Then I turn on "color management" and use HCFR and a display one to adjust the color gamut. I have to decrease the gain on blue and green significantly, and tweak the phase on all the primary and secondary colors. Once I've done that I can get quite close to the reference points on the CIE chart. But I'm also no longer even close to passing the color/tint test with the blue filter. When I used the "color management" blue gain control to bring blue down to the reference point, I threw the whole color/tint setting out of whack.
I can then use the blue filter test to rebalance color and tint, but if I do that I once again have to use "color management" to decrease the gain of blue and green, etc. That didn't seem like the right thing to do, so I stuck with just one iteration of balancing color/tint with the blue filter and "color management" turned off, and then "color management" turned on to line up the CIE chart. Don't ask me if that's the right thing to do. Colors look natural, but I don't know if a slightly modified procedure would be better, or why what happens to me happens (or if it's supposed to happen).