This article seeks to divide and provoke.
A reasonable request and a (broadly reasonable) response from NCSC. It's easy to implement and should just crack on.
But the terms aren't racist. And calling them so, is to make people that have been using them for years bridle at the suggestion that they somehow are. The NCSC is right to make the decision, but wrong to suggest that they are 'stamping out racism'. They're not. They're just noting the issue, and being considerate.
While they're not racist (the etymology doesn't hold this up), they do indicate a positive and negative status. So they can contribute to a narrative - right or wrong. Recognise it and move on.
The problem with these changes when they're handled badly, is that in a couple of months or years time when someone inadvertently and without malice uses the term, someone somewhere will jump down their throat and insinuate that they are racist. That helps no-one. What it does is make people justify their position (understandably), and argue why it's not the case. I think a bunch of the arguments above are just that. I get it, and I'll be honest, if I wasn't post 33, I can totally imagine doing it myself. But I also know that doing that just creates cover for those people that are actually racist, who are arguing it for their own reasons.
So be kind when implementing it, and find more important things to get excited about.
Incidentally, the argument of black chips and black belts isn't entirely analogous. They're not binary or 'opposites'. There are other colours of belts and chips, and so the distinction isn't as overt. And when it comes to Black Tie, the opposite isn't a white T-shirt. White Tie is considered more formal and 'elite'. Need to find an example of things being called just white or just black where black is positive. They don't come to mind easily, though.