The technology is aircraft carried, so a larger UAV can carry it. I would assume that the need to operate it from a satellite where regular passes can be made has occurred to many people
A satellite is an inherently stable platform so it is ideal. Conversely, I cannot see any reason as to why it could not be used on a submarine as well. (which gets back to the infamous "blue laser" technology)
The thing about Australians is that we don't like being told that things can't be done, and because we don't have the defence budgets of other countries, we tend to do things a lot more cheaply than other militaries.
There is a lot of "smarts" in this country - more than what most Australians are aware of. Problem is that half the time we end up losing such technologies overseas as the monies aren't available to further develop them.
In the case of the above system, that isn't the case though.