YouTube: Missing option to delete channel
If you follow YouTube’s guides to deleting a channel, you might find that in your case the Remove YouTube content
is missing altogether. This seems to be the case with newer account, but no worries there’s a workaround.
Go to YouTube Studio instead. Go to Settings > Channel > Advanced settings and scroll to the bottom. There you should find the Remove YouTube content option available. Click on it and follow the instructions to have your channel and all the content associated with it removed.