... moving this extension to Extension:EmbedVideo (Hydra) and move Extension:EmbedVideo (fork) to this place, i.e., Extension:EmbedVideo. Since this one is unmaintained and abandoned, it would help to get people to the correct docu more direct.
Topic on Extension talk:EmbedVideo
Separate from the potential rename, this one should probably be archived. If Fandom ever decides to re-open-source their stuff, and have been maintaining/developing EmbedVideo in that time, it can be unarchived.
As for the rename itself, it's worth noting that extensions listed on Special:Version often link to their MW.org Extension: pages, and EmbedVideo is no exception; if the pages are renamed, this means people following one of these links will end up in the wrong place.
In other words: You oppose moving the pages and rather archive this one. Fine with me, too.
What if this version isn't actually unmaintained as it was picked up after the Fandom and Gamepedia purchase and continues to be maintained, albeit for their platform at least and it can be viewed at the new location here github.com/Wikia/EmbedVideo while the gitlab repo is just the legacy version when Gamepedia was still around.
Not sure, however, in the meantime it is best to keep things as they are. A pointer to the fork is at the top of the page now. Everybody can use their preferred make of the extension.