EmoteLib is listed as All Rights Reserved, which takes decades to expire. Even though the original author is unknown ("_ForgeUserNNNNN" is a placeholder for someone who canceled their Curseforge account) the rights still exist with whomever that was. I doubt an admin would hand over the project given the legalities.
However, you can fork the project and make enough changes to make it your own, in which case you are safe from any legal fallout.
In that case, click the link above, look to the right for the flag icon and notify for admin or moderator changes :)
As a side note, all addon code defaults to All Rights Reserved unless otherwise specified, because all intellectual property is copyright by default. Specifying All Rights Reserved is for other people who don't understand the law.