Simpson family trying to clean-up & re-write OJ's legacy - it ain't happening.
The first is a statement by a witness. The second is hearsay that would probably not be admitted in court. The third is gossip, or a lead to be investigated, if you want to be generous.
This claim is in the third category. If taken as a lead, it is hard to credit as true. The crime scene forensics did not show multiple killers, and the only shoe print at the scene was O.J. Simpson's show size. Simpson's lawyers never claimed that was faked.
A great deal of other forensic and circumstantial evidence also pointed toward Simpson as the lone killer. And if Simpson hired Mafia killers, why did he not also bother to arrange an iron clad public alibi?
Also, Mafia killers generally use a gun instead of a knife. A knife means risk, a messy crime scene, and blood on the killer, the sort of things that professionals avoid. How is that to be explained? That the standards of Mafia hit men are slipping?
Moreover, in spite of the immense attention and resources devoted to the Simpson case and to law enforcement surveillance of the Mafia, no one has ever come forward with a shred of actual evidence that the Mafia did the Simpson killing. No wiretaps and no member or associate or witness looking for a deal has ever come forward.
This story seems false, not even up to tabloid standards.