Ok, I get it. Apparently DxO tries to make the colors within each camera model’s RAW output image look close to the same image processed within the camera and then output from camera as a JPG image (thereby recreating the “character” of the camera’s internal JPG processor – which means both the camera’s JPG output and the processed RAW will both have very similar appearing colors/light).
And since the camera’s combined color sensors can respond differently to color under different lighting conditions, the photographer might want to save several color profiles within their processing software to select from in order to more precisely color correct under specific lighting conditions.
And, I guess it doesn’t matter whether the display screen is calibrated while using something like ColorChecker to calibrate camera color because the calibration software is aware it’s looking at a representation of a standard color chart (as captured by the camera). So, the software should be able to relate colors in the standard color chart image from the camera to standard reference values for those colors (software recognizes colors which are close to the standard reference colors and provides corrections to push the RAW values toward the reference values).
But seems like camera color correction would be most useful for repeated studio lighting and might not be so useful for out-in-the-wild shots. I assume that the DxOs default color rendering for each camera is a “respectable” average of a few cameras of same model which presumably does also consider the lighting situation to some extent.
In case someone’s interested, here are a couple related random links (not necessarily the best links)…