IIRC, what you are referring to is in the text-epilogue/credits of the film. It said something along the lines of 'the Camorra even invested in the reconstruction of the Twin Towers.' Agreed that it was a somewhat bizarre 2-3 seconds of information. But I don't remember the film explicitly connecting them (or insinuating connection) to the attacks, just the reconstruction investment.

It's excellent otherwise. Especially in that it doesn't romanticize "the lifestyle"; which is a rubbish cliché, endemic in many criminal enterprise films. Other films that I think are successful in this sense are: "City of God" (Portuguese title: "Cidade de Deus") and "Maria Full of Grace" (Spanish title: "María llena eres de gracia").