No, it's the "flatness" that worries me. Like printing ink yellow, not like luminous sunrise yellow.
I think that is probably due to how the image was processed (probably using something like the ProPhoto RGB colour space) and then lossy compressed into a Jpg before upload, rather than how the scene looked at the time of capture. So I imagine it looks a whole lot better on Hans's computer screen and print, than it does in the link you provided.
But after saying all that, I have also noticed how reds, oranges and yellows, of the type seen in sunsets/sunrises, are so easily blocked up during processing files from modern sensors. So if you are not really careful when tweaking the colour enhancement sliders in whatever processing software you choose to use, then it can so easily start to go horribly wrong very quickly.
Dave