They were widely reported to be. At least the drones they were used on were, because the majority of the reporting was on the drone, the Bayraktar TB2. The TB2s provided by Turkey to Azerbaijan were widely reported to be a game-changer. They have allowed Azeri forces to strike farther than they could very quickly, and Armenian forces, to my reading, didn't really have much of a chance to defend against them. From the outset this created a shift in the conflict.
On December 10th, 2020. See this statement in context.