Sadly, that solution doesn't work. "Subscribed By" is not a possible selection in the Results Layout. No "Subscribed By"column = no bulk unsubscribe.
I discovered you can export the "Subscribed By" column even though it doesn't appear in "Results Layout". I figured I could delete my name and then import it back. No luck. It neither removes my name nor generates an error. I tried replacing my name with another user, but that didn't work either. It appears "Subscribed By" is ignored during an import. So we are SOL on bulk unsubscribe. You CAN change the "Created By" using the "export/change created by/import" method, but that does not unsubscribe you.