This whole thread is about adding a new player to the repo, so ofc none of the ones mentioned in the first post are in.....
Make sure you do read what kaOS is (see the Home page and About), repos are limited, there will never be more then 2000-2200 packages available, so dozens of just music players is not an option here. This does not mean you don't already have a good selection of players. More then 10 are currently up, including mplayer & MPV as cli driven, to the defaults smplayer & cantata, to kodi, kaffeine, dragonplayer, qmmp, vlc, clementine and plasma-mediacenter.
If you do want to add some yourself make sure you understand what it means to build and maintain packages by reading https://kaosx.us/docs/package/ and https://kaosx.us/docs/kcp/
New users who clearly do not know what it means to use KCP never should just blindly use kcp -i.
Always point them to the 2 guides (linked above) 🙂
Once those are read, kcp -i is explained too. When and how to use.