Hardware unboxed will still make reviews, they will just have to buy their own cards now.
Their 3080 and 3070 reviews do cover RTX:
Their 3090 review, however, doesn't mention it once:
In their 6900xt review they do benchmark AMD and Nvidia cards with ray tracing:
I don't know what PR person at Nvidia got a stick up their bum, but it seems to me like HWB covered RTX. They don't spend a lot of time on it, and they did bury it deep in the video, but it was covered. If Nvidia makes features for graphics and sends press review units early I think they can insist that they at least mention their marketable features. That makes sense. But HWB maintains their own editorial discretion and independence. If HWB isn't excited about ray tracing then they aren't obligated to spend more time on it then they think is appropriate.
The details are in the reviews guide and whatever terms Nvidia maintains with their press partners, but it seem like Nvidia was really immature about this one.