Must be a bot account. I thought perhaps I didnt have permission to delete from the playlist.
It looks like playlists can set up in such a way that only invited collaborators can contribute. Seems like this function was added, in part, in response to this type of playlist spamming problem.
https://community.spotify.com/t5/Implemented-Ideas/Playlists-Only-selected-Playlist-Authors-for-Collaborative/idi-p/201374