It is quite simply Triumph's own diagnostic tool, but not a map editor.
TuneECU is a non OEM and both a diagnostic tool and a map editor, TuneBoy is another non OEM diagnostic tool and its sibling TuneEdit is a map editor.
Dealertool is another non OEM diagnostic tool but has no map editor.
The only real difference I found that Triumph has that the non OEMs don't, is the ability to unlock new bikes' ECUs and new spares ECUs. But you also need the passwords per model for this.
P.S. that T3880059 look like just a cable, no OBD plug, plus the Triumph software is required too. And that costs like a €1000 and is meant for dealers only really