The video link was correct at the start. I believe that OP has decided to change it due to rate of doomism and rising depression levels.
Uhh isn't that a big flaw with HN if you can?
(for example, link to a blog post that would be popular with the community to get upvotes, then switch it up for your own company blog or something to get the traffic)
Submitters can't change URLs once they've submitted.