Yes it is true. You can hear the side by side comparison here from XXLmag.com who broke the story.
The Thieves: Jermaine Dupri & No ID: Jay-Z – Fallin
The Victim – Ski Beats: Ballin’ (Instrumental)
This is what Ski had to say about the situation
“I did the beat first. That beat got played for so many people. I sent it out. [They] could have bit. But that doesn’t necessarily mean [he bit] when you fucking with samples; [they] could have just found the same one. I’ll let the people decide. I got my new artist Pittsburgh Slim signed over at Def Jam, [so] how ironic.”
Ski has a rapport with Jay-Z being that he produced some of his classics including Dead Presidents. I am sure we will hear much more about this story. We will see who knew what about the situation.