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I don't know anything about popcorn app specifically, but you'll normally see a message (instead of a 404 page) if GitHub removed a repository.

the Yify fork is gone as well. https://github.com/Yify/popcorn-app

That one(Yify) redirected to the other(popcorn-team) one, if I'm not mistaken.

I'm not sure when the site was updated, but it looks like it goes the way of muxtape - http://getpopcornti.me/

Edit: Looks like this was written almost a couple weeks ago (March 14th, 2014 according to the time stamp on their medium post https://medium.com/p/93f890b8c9f4)

Ya those are from the original version, that the developers shut down on March 14th. The GitHub that the OP linked is the link to the new GitHub fork that is/was under active development. Not sure what happened but the saga seems to be continuing