MarsSeed [1] filed a deletion request for kaudiocreator-git [2]:

Last released 15 years ago. [a]
No longer distributed with KDE. [b]
All maintenance discontinued 4 years ago; upstream repo archived. [c]
Depends on kdelibs4support, which is EOL and won't be supported on KDE
Plasma 6, coming in a few months.

Not useful to keep this package on AUR.

[a]: https://invent.kde.org/unmaintained/kaudiocreator/-/tags
[b]: https://apps.kde.org/kaudiocreator/
[c]: https://invent.kde.org/unmaintained/kaudiocreator

[1] https://aur.archlinux.org/account/MarsSeed/
[2] https://aur.archlinux.org/pkgbase/kaudiocreator-git/