Tigron wasn't Qirex.
They bought up their stuff though, but the team had little in common, beside being money obsessed and had a special relation to the Leagues Commision.
Tigron was the economic arm of a Russian crime syndicate that took over the country and brought it back into Sowjet times.

It's like saying that BrawnGP was actually Honda, or that Mercedes is BrawnGP. Or that Red Bull Racing is still Jaguar.