Don't know why that is relevant, seeming plex them selfs have forked the repo. (where all the other released plugins are -> https://github.com/plexinc-plugins)
What channel is it? Also if you've made changes on your end you'll have to send a pull request to get it pulled into the plexinc-plugins version (it has to be tested and then pulled into the main repo). After that there are other steps involved in the updates getting pushed out to everyone as well -- so even if the updates show up in the GH repo it doesn't mean they have yet been pushed out through the store. Sander is the person to contact about that stuff.