It basically says what I would expect, but then I'm a tech-savvy privacy nerd who knows how this sort of tech works. Any particular reason you asked?

I've asked because the mac of your Bluetooth is linked to your device and therefore traceable to the user, don't you agree? and then, for what reason should I share the BT address with a remote contact that i will never see IRL?

If you won't ever see them... keep in mind you're posting in a thread titled "Briar 1.4 - Offline sharing". It's meant to be used offline and you're broadcasting your MAC address where-ever you go anyway. Doesn't mean others should track it (I had some interesting experiences with my WiFi MAC ending up in some tracking database), but it's not for a lack of ability.