Amazing little shrimp! Yes lodo, cold water is the problem in keeping many cool-temperate aquatics and especially those from mountainous areas. I haven't checked these out but i doubt that they have any tolerance to warmer conditions. 15 degrees C is the maximum tolerance of a few Victorian fish species, I imagine highland Tasmanian shrimp would need colder.
Having looked at the links now, the species only occurs in the World Heritage area in SW Tas. It would be a serious crime if these were to be collected, and there's basically no chance of the average hobbyist keeping them alive anyway. If a breeding program was ever to occur it would be conducted by a government agency under strict control. There are other species from this ancient family (right, Buck!) in Tasmania and perhaps some of these are not endangered, occur in lowland areas of northern Tasmania and would be suitable for captivity. Great little shrimp anyway John, I had no idea about them until today. Thanks!