I don't know which country he is referring to. As for the US, a licensed pilot is not even required to have a logbook at all! Any kind of record will do that shows that the recency requirements are met (flight review, instrument proficiency, 90 day rule). And those documents don't need to be "readily available", they can be kept at home.
Only the license and the medical certificate (in the US two independent documents) need to be carried on board while flying.