The tiger shark is kind of bizarre. I guess you can have them do ground attack missions by just sniping targets dead from miles away. It's not clear if the drone weapons have a cost or if you just pick one.
It reads like you just pick one, although if that is the case it would have been better to just say it comes with drone X but can swap to drone Y for free.
You are spot on with the ground attack missions, the AX-1-0 was designed by the Tau as a counter to titans and super heavy tanks so being good at blasting ground targets from long range is true to the fluff