Alex responded: "I worked for Joaquin Guzman Loera"
Lichtman: "Another systems engineer?"
Alex: "Among others."
When Alex said no, Lichtman reminded him that he'd made a lot of trafficking drugs. He asked again, "Un poquito successful?"
Alex acknowledged that he had made "some millions."
Then he asked about Chapo. "Is he the only person you didn't lie about?"
Alex replied: "That's correct."
It's not about the corruption. It's about the witness changing his story, which suggests he's unreliable.