Join Date: May 2009
Location: South Carolina, USA
I know the far right IG part of the image is from a GW book cover, so it would be subject to GW/artist IP. I am not sure about the fantasy imagery (and I agree it is odd to have AOS/WFB stuff as such a majority of the banner on a site that is mainly 30/40k).
The biggest problem that you are going to run into- as I have been taking a quick search of the copyrights- is the fact that GW holds IP on just about any and all imagery related to its games: chaos icons, imperial eagles, astartes, imperial guard, fantasy stuff, etc down the line.
So, just about anything the site uses relating to GW products will be a risk of IP, unless the image in question is used with permission. There is a little bit of wiggle room, but not much.