How about making up random bullshit narratives, we look at what information we have in front of us. They are closing down messenger and wanting people to move to skype. The Xbox currently has messenger integration. Ergo, that is going away and getting replaced with Skype, just like we already know it is on PC. I see nothing here that indicates anything at all is happening with party chat, the current messaging, or anything at all besides removing messenger integration and adding Skype integration.
I mean, really, what seems more likely to you: the obvious consequences of replacing messenger with Skype apply to the Xbox just like everything else, or some shitty gaming site I've never heard of and which has an alexa rank of 8,429 is breaking the news that party chat as we know it is getting replaced?