Unfortunately the script doesn't belong to OpenWrt project and we cannot fix it directly. You could contact the author. In the meantime I'll add a remark to make the necessary change before running it.
Do you mean the script linked in the wiki page at https://www.abitare.org/bin/download.sh? Afair I wrote it a while back and it used to be embedded directly in the wiki page. Maybe we can move it back there and fix the keyserver preselection while we’re at it
That's the one indeed It just says 'this download.sh' script without further note so I just assumed without much thinking that it was provided by the OpenWrt project.
That might be nice indeed. But if hosted in the wiki, it wouldn't be possible to use curl or whatever to download it, right? Having it as a file with a dedicated URL is handy.