falkTX is the developer behind KX Studio and also Carla, Cadence, and DISTRHO plugins. He is also a primary developer of JACK. I recall reading somewhere recently that the KX repos would be keeping his own projects up-to-date but not maintaining other software due to lack of support from the community. So far LSP plugins also appear to be current but I'm not sure what else. The Ardour version from there is positively ancient (v5.12).Linuxmusician01 wrote: ↑Mon Oct 18, 2021 9:01 am I almost posted a topic with the title "Are the KXStudio repo's done?"
He unfortunately left this forum due to a dispute over sponsorship (which discontinued anyway after a brief trial).
I currently have KX repos active in Debian Bullseye and have not seen a Release file error such as you posted. These kind of errors happen occasionally but are usually resolved quickly.
So KX repos are not done for software developed by falkTX, but it may eventually be worth looking elsewhere for other software hosted there.