Always nice to see DE take out a Riptide! Well played, and another enjoyable batrep.
Tau Turn 1, I believe, when they scored Obj 5 in your right-hand corner;
To my eye it looks like he scored with the Gun Drones? The piranha seems pretty far from the objective. I may be eyeballing it totally wrong, but if this is so it shouldn't have counted.
And then again T2 when he used the drone to score for the "linebreaker/12" of table edge" objective, no dice.
Main rulebook p.134, "Any unit can be a scoring unit, unless: ... It has a special rule specifying that it never counts as a scoring unit."
And Tau codex p.33 "A unit comprised entirely of drones is a non-scoring, non-denial unit."