I always thought it was meant to mean that he had been somewhat subverting the Viltrum empire all along. Maybe somewhat subconsciously keeping records of threats to Viltrum incase he ever turned coat.

Probably an early indicator that his life on Earth had changed him despite what he thought.

Soo excited. Going to be interesting to see how they pull it off giving how fucked up and brutal Nolans attack on mark/earth was last season compared to the comic