Oh nice, progress! Finally!
“Actively supported with some nudging” - well, the last update was 5080 in January 2023. 
5130 is currently only available for OpenWrt snapshot builds. And it’s not completely finished yet - automatic migration from the old 5080 package is still an open PR: ripe-atlas: follow-up changes after PR which added package by commodo · Pull Request #30067 · openwrt/packages · GitHub
If you’re using 5080 on OpenWrt 25.12.x and want to try 5130 on OpenWrt snapshot, this is what worked for me:
owut upgrade -V SNAPSHOT -a ripe-atlas-probe -r atlas-sw-probe --force
Since the current snapshot doesn’t include the migration feature yet, I did let it create a new ssh key and updated it on the probe’s page. Seems to work.