YouTube Music and YouTube Content ID share the same feed. This means that if you distribute your release to one of these channels, it will be automatically distributed to the other one too. If you don't want your release on YouTube Music, it is therefor necessary for you to take it down from YouTube Content ID as well.
If you'd like to keep your music on YouTube Content ID but you'd rather don't have a topic channel, you can merge both your topic channel and artist channel by creating an Official Artist Channel. You can read about how to do it here.