Again, no, the most noticeable colours on Kon's outfit were black and BLUE, since he was wearing blue jeans, and a t-shirt which was 90% black. Anyone looking at him would see black and blue first.
And the "clearly stated" reason was a one panel, throwaway reference in one issue of 52, it was never once referenced in Robin's own title, even in the sequence where he explains to Dick about his new costume.
And if we're going that far, Jason wasn't even the original choice of character for Countdown, that was going to be Dick Grayson, whose survival after IC was supposed to be an anomalous event in it's own right, hence the foreshadowing with shadowy images lurking around him going "You ought to be dead", which came to nothing for Dick.