Hi Hugo,
Sorry for the inconvenience.
However, it’s not possible to do not load the image background on iPhone X, because there has nothing coded for specific devices that cause to do not load the image background on iPhone X.
Moreover, if you are using weighty images then it can be loaded slowly for the images.
In those issues, you could check out our theme’s live demo on iPhone X as the reference.
Best Regards,
ThemeLooks Support Team