The man has no paper trail
The journal entry started "I'm still injured. But thanks to the old man's gamble I'm still alive. The captain and crew of this ship that found us don't seem too phased by my reputation. The head of "maintenance", whose name I will not mention for security reasons until I have confirmation that I have the job I'm looking for, in every sense of the word seems pretty tough. I met an old friend who again for security reasons I will not name."
Gregorio never put other people's names in his book, as not to leave an incriminating paper trail the feds could use against either them or Gregorio himself. And Gregorio also kept no secrets in the book either. If his employer wanted to see the book, he simply handed it over to see. He had nothing to hide.