Followed these steps b4 when I mentioned I was able to deactivate the device. It no longer shows up under my google acct. So I can no longer do anything through the default instructions given. Despite device not showing up video history & YT search history still go both ways. 
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Sorry to hear you're still having trouble. With such cases, we'd recommend sending a feedback report directly from YouTube, here's how: https://yt.be/help/feedback
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Thanks
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