I know very little about the case, but how would disparaging Tutanota help his case in this scenario? And why would anyone in the intelligence field need to justify using a privacy focused service?
"I did not use the privacy focused email service for my conversations with criminals because I wanted to sell classified material without being surveilled. I used the privacy focused email service to make it easier to catch these criminals, because it's very very surveilled! A reliable source once told me this. No you can't meet her, she lives in Canada^W undisclosed location. Not guilty, your honor."