I don't really give a damn about what they want. They are licensed pilots. Part of the requirements of being licensed means when accidents happen, you talk to people. If that talk is recorded, so be it. The recording works both ways. If the interviewer is being a dick and refusing to listen, then the recording will show that. If you're being combative and refusing to cooperate, then it will show that too. This argument falls flat with me regarding police body cams.

Hoping a note taker misses some salient detail in your favor is just trying to game the situation when you probably feel you're at fault. This isn't someone that committed a crime and is facing a judge/jury with possibility of going to jail. This is a licensed employee responsible for the safety of a not small number of other human beings. Some things stand to higher accountability