I guess signal preview-loading or remote-image-loading features are always going to be usable to identify broadly what region a user is in, using this attack.

Can one disable those features in Signal? Would be annoying becuase they are nice, but yeah.

If you don't want that attack to be able to locate you somewhat (or at least locate your internet endpoint, if you are using a VPN or something), you will need to turn off signal previews and network image displays. Right?