I wonder if it's got a Clear View Screen [1] at an offset in front of it, the round window thing you see in ships. Basically a round pane that they spin really fast, throwing any water off right away.
Shameless plug of a youtube channel I enjoy, here's a guy installing one of those in their CNC machine to make better footage [2].
>>Cthulh+(OP)
It doesn't look like it, there is some more footage online of that drone and you can clearly see the spray stick to the glass in front of the camera.