He's trying to make sure it is known he is professional, which is worthwhile particularly when there isn't any bad blood. He noted elsewhere he is under NDA, an

He's trying to make sure it is known he is professional, which is worthwhile particularly when there isn't any bad blood. He noted elsewhere he is under NDA, and would be strongly implicated due to his leaving before he was done vesting. Bad blood comes from talking smack about the people who acquire your company.