I was coming here to say, now that we know it was JD who first suggested taping these conversations, it all makes sense.
IMO, the fact that they are both adult children of addicts is all.
This sounds very much like conversations I had with my best friend, also an ACOA - in middle school…
I suspect very much that Amber got in trouble with her parents as a child when she got pinned down in a lie; and that as a result she’ll do anything to avoid getting pinned down in one as an adult, because it means punishment.