He didn't, he was charged with five murders, was convicted of two, copped to two and then copped to the Calabro murder later, that's it. No killing homeless guys on the Westside, no Jimmy Hoffa murder, no Joey Gallo murder, no Roy DeMeo murder, no John Favara murder. In reality, he was only a low level thief and an even lower Times Square porn operation associate, who produced porn copies for Robert DiBernardo. He got behind on a shylock loan from DB, who promptly sicced the Gemini Crew on him, they clocked him in the head with a metal film case, leaving a permanent scar he talks about. He was observed once at the Gemini Lounge by NYPD Task Force Det. Kenny McCabe, where allegedly bought a gun from Roy, there.
The money he earned from the HBO Series went to his wife and kids, so he was incentivized to elaborate his stories for the sake of his wife and kids.