I don't think it needs to be that facetious, Tim. The whole idea, in this case, is just to draw your attention to the screen, so a simple "Traffic" or "Bearingless Traffic" would suffice.
Even better would be "Traffic, 200 ft above".
The fact that no other information is given means I don't really even need to look at my screen because I already know it's bearingless. Being given the relative height means I REALLY don't need to look at my screen.
I do understand the scepticism and reasons for the scepticism regarding bearingless traffic but I definitely pay much more attention to looking outside if I get an orange to red circle around me, so think there is merit in the warning. An audio prompt allows that to happen sooner, as I look at the screen relatively infrequently.
I welcome the day that we all have position information in our electronic outputs but, until the CAA mandates it, we still have to live with those who plough the skies without it. Just look around the Bournemouth extended area on a busy day and see the numbers of Katanas and Diamonds, from the local training school, flying around without ADSB and you'll see it is not an imagined scenario to sometimes only have bearingless traffic.