I played a match vs AI and it was against the Tau Protector Fleet. During the match I found this...
It seems the game considered the Demiurg ship as the admiral ship. They also had another battleship (tau oresthingymajig).
Tau fleet creation rules require a Tau ship to be the Admiral Ship, but the AI ignored it.
This has also happened to me several times with both classes of Demiurg, and there has been several other odd choices for fleet admiral in the same or other games, (it picked things like a light crusier as an admiral in a fleet with several cruisers and grand cruiser for exmaple as the imperial navy in the same game I had a demiurg bastion being a tau flagship)
