It's because of this:
"full-array local dimming that comprises 132 zones."
That's a fairly minimal amount of zones for HDR. In my experience upwards of 1000 is the sweet spot for optimal HDR quality. I know that this isn't OLED but I've seen how bad things can get when a display doesn't have enough. Here's an interesting read on it with some general info.
https://www.hellotech.com/blog/what-is-full-array-local-dimming-tv
I'm not saying one of these couldn't look good but for now, I'd be skeptical about its HDR gaming performance. That's why many TVs are better at it than gaming monitors. That's also why I jumped ship back to LG from the CRG9 I was using as I do a lot of gaming that uses HDR. I think a bunch of the bad rap that PC HDR gaming gets is due to the displays their rigs are hooked up to but not denying there is also some lackluster effort from developers as well. You see it on a good OLED display, or great quality LCD (things are still impressive on my Sony Z9D 65" (648 dimming zones with over 1000 nits), and it's a whole new world for many games. The size of the panel definitely affects how many they can cram in there but still 132 is a bit low. I'd guess that for 55" it should be closer to 300-500.
Edit: Here's a thread on AVS forum with people discussing the different sizes of Z9Ds back in the day along with how they had a different amount of dimming zones per size, and even release region.
https://www.avsforum.com/threads/inches-versus-zones.2948556/