Yes, thank you for doing the mental calculation for me. [The words are sarcastic even though his delivery is calm. He might not be particularly worried, but he is annoyed. Gestures briefly with the hand holding his journal.]
The methods of communication certainly have progressed in an impressive manner, although it seems that this [the journal] is a feature more or the less unique to this realm. [Right?]
[He thought it was technology at first and was prepared to be impressed by human inventiveness. How disappointing.]