Unfortunately, this fails, because DTube videos are only hosted as long as the Steem rewards last. (Mind you, the storage costs aren't much at all, and according to what they said, a typical video can be retained for many months on just a few cents.) Since no one upvoted within 7 days, it got no rewards, and thus is now not being hosted. The video is gone, as a quick IPFS request will show. DTube videos technically can't be censored, but they can disappear for lack of popularity, or if they stop being hosted for some other reason. It's completely unsuitable for serious archiving.