Iv already marked my channel as not intend for children within the YouTube settings. Bot already knows. The op's concern is that intended could be open to interpretation. So if you put a disclaimer in the start of the video saying this video is not intend for children. You are making it clear that your target audience for the video is not for childrenHow can it hold any weight if the Youtube bot can't actually read it? That probably won't help, unless maybe you read it allowed and stress the word 'adult' so that hopefully the bot can pick it up and determine it's an adult channel.