hmmm in theory it shouldn't be - for instance, the images in the reference post are rendered in Maya/Arnold - the exr is loaded into a dome light and rendered - nothing changed except to rotate the map to match the light direction in Terragen.
However if you look at the your HDR image in something like Photoshop and do a 32 bit sample of the values you'll probably see that sampling the centre of the sun produces values that are many thousands times brighter than any other part of your image. There may be something to adjust in Daz that might fix this - you'd need to get on the forums perhaps for some tips.
However in most professional studios a common workflow is to use two versions of the HDR (or EXR) map. One will have the sun painted out and the other with just the sun extracted, and two separate lights in the scene to use the modified maps. That way the main keylight coming from the sun can be adjusted in relation to overall ambient light (for example the light from the sky and the ground). Usually these separate lights can be left at default intensities and they will approximate the scene the HDR was taken from, but in your case it could adjust the sun (key) light down to a more manageable level.
Before renderers like Arnold had a clamp facility, I used to clamp the output of dome light to prevent "fireflies" - these were bright pixels in an image that were often produced by having a light source with very high values ( like 20, 000 +) in an image - in most cases clamping the max value of the HDR to something as low as 100 didn't change the overall look of the render but prevented the firelflies.
You might want to experiment with clamping your HDR to a similar value - either in Photoshop or on the fly in Daz if such a feature exists