I'll update when I figure out how to add in the Autoplay
But use this link
Super Smash Bros. Ultimate – The Final “Mr. Sakurai Presents” - Nintendo Switch - YouTube
Or if you want to do it yourself, go to the Sakurai Presents video, perhaps bookmark it for later. When you go to the video, go to the Sharing option and Click on Embed. You should see something like this
It's the youtube link, but it's changed to have Embed in it. This will put the Video on Full Screen
From there, if you on Phone, click on the Screen to have it play, if it's on Computer, Click on the video to have it Play. Also make sure after you hear the Video playing, don't move or click anything else (try and put the Mouse cursor in the Middle so it's not hovering over the Options at the bottom, and wait like 5-10 seconds.
The reason to the that is because Nintendo is likely gonna update the Video with the name of who the Character is, and we don't want that
Hopefully, Someone will make a version of the video to not spoil it in advance, after the video is done. but you would have to wait for after the presentation is done and go look it up without coming across the Character's Name. I either suggest going on Smash Reddit, or maybe Smashboards will have a thread that put's spoiler tag on everything for those that can't make the viewing live