T-Mobile (U.S.) got owned?

Few minutes ago I came across a full disclosure post saying no more no less than

Like Checkpoint Tmobile has been owned for some time. We have
everything, their databases, confidental documents, scripts and
programs from their servers,financial documents up to 2009.

If that's true... Ouch!

Just few hours ago I was thinking "what a nice and quiet weekend evening", hmmmm... seems it was just a quiet time before the storm hits. I guess that news coming from the world may be very interesting, so let's wait and see what happens.