The rule that says pure black and white combo colors are unrankable does not exist in the Standard Ranking Criteria, and in the case that it should be an unwritten rule it can't be used to justify an unrank on it's own since it is not written down.maybe they just got [UNRANK] button
I'd also like to say that the QAT members responsible for unqualifying this should be much less hasty to unrank on shallow reasons like these.
[ QIUT ] member list：
ehhh still in work
like u siad responsibility and punishment