It has already been communicated already that Binary Factory is to be decommissioned and replaced by GitLab CI.
That part of the transition alongside the QT6 integration work looks like it is still ongoing.
Look for the craft_macos*
named Jobs - which are failing.
And here is the overall pipeline - Pipeline · Network / KDE Connect · GitLab
It is interesting to see this comment on Binary-factory.kde.org down - #11 by jlskuz
For the download of nightly binary artefacts an easier to use replacement will go Live in the next days.