As of right now I no longer get the error.
Almost two weeks ago, I tested it with a VPN from all around the world and got the same error.
€: now I am having the same error again. What I noticed is that it happened after clicking on 'hardcover'. The last time it was the same way, the site worked fine, and after clicking on 'hardcover' the error came up.
Just started up a different browser in private mode, navigated to the site, clicked on 'hardcover', and have the same error again.
With chrome, I clicked on 'adventures' or something, and same error. Cant get the browser to work with this site after the error comes up.
I managed to see the three images in the carousel, and clicking on 'the scouring of gate pass' worked.
Maybe this helps. If I can help by testing something, just let me know.