Someone posted a link to a more complete transcript in one of the sibling threads here. I think it is ambiguous whether or who thought they were being recorded. They do in a couple instances talk about some things (people they think or know have isotopes or something like that (I don’t know anything about the physics), and some patents) that they don’t want to reveal to their captors. So, I think I’m the very least they weren’t all on the page of “let’s do a big counterintelligence type ruse.”
Of course there are also layers of intrigue going on; they are all colleagues but they must know that they’ll ultimately be interviewed to determine who was really loyal to the Nazi party, so to some extent they are probably trying to convince each other. Meanwhile the guy writing the transcript seems generally to have opinions about their personalities, and a genuine concern for their well-being to some extent, so I’m sure that colors his analysis too.