It’s a justification because he talks in AI word soup in real life. That’s the punchline in the comic. His defensive justification is that he sounds like an AI in his email because he just happens to sound like an AI all the time. There’s no rationalization required if he didn’t use AI to write emails and the justification for him sounding like AI in his emails is that actually sounds like AI all the time.
It’s a justification because he talks in AI word soup in real life. That’s the punchline in the comic. His defensive justification is that he sounds like an AI in his email because he just happens to sound like an AI all the time. There’s no rationalization required if he didn’t use AI to write emails and the justification for him sounding like AI in his emails is that actually sounds like AI all the time.