the tv director and his crew (FOM) choose radio snippets which don’t reveal anything that would give a rival an advantage, all the teams can hear what we hear don’t forget.
there is usually a delay of around 20-30 seconds or so to agree on a good bit off conversation, so that swearing can be muted and the audio can be trimmed down.
They made a great choice today with Bruno who talked about a full lap of Spa as he went round and even picked out his favourite corners. That was a lovely bit of radio.