I think this an uncharitable take – the parent comment is just proposing an improvement that would really help them given their colour-blindness (they also say they like the visualisation). Personally I find part of the reason for putting things on the internet is to allow other people to use them and obtain their feedback.
Every product has flaws which are outside of design scope. Pointing that is unnecessary. If I want feedback on my quick and dirty project, I want it on within the scope of design, not the missing features, bad accessibility etc.
Specially HN crowd is very susceptible to feeling for accessibility comment. Return of "think of poor kids in Africa".
