Is this for specific verisons of macOS?
The article doesn't mention it.
It's in the environment and test setup (26.4 at the moment, but it is the same across all 26.x releases I've tried).
I'm still on Sequoia and haven't noticed these issues on my M4 Pro.
Out of interest - whats the output of `system_profiler SPDisplaysDataType`?
You can see the result here:
https://gist.github.com/PierBover/99f44e5cba1657eb7e4ce8e2aa...
I'm on macOS 15.7.4.
It's so weird that it says 5120 x 2880 when the ASUS PA329CV is 3840 x 2160.
That's a 404, but if it only says 5120x2880 then you're not running full 4K HiDPI which would show 7680x as per the blog post.