Strange.. I was so sure I unsubscribed from Blitz on #YouTube months ago, if not longer, and if I look at his recent videos, I don't recall seeing any of them show up in my subscription videos either. However, just now I spotted a single video in my subscription videos list, and sure enough, apparently I was still/again? subscribed to the guy. Tried checking https://myactivity.google.com/myactivity?product=26 but it looks like '(un)subscribe' isn't an activity log item that is available.