Why are people mad?
Nuclear policy in Australia is more about maintaining coal mining contracts for as long as possible and less about actually building nuclear plants. Because if you were going to do the second, you'd need to radically fund and create nuclear engineering positions and industry to support the power companies and the oppositions hasn't mentioned much about any of this.
Do you see how the argument is overly general? You can use it to shoot down anything that's not immediately useful. It's especially silly at the level of nations, which can obtain money much more easily than a random individual. Cash flow is much less of a problem at that level. The way it's phrased exploits people's tendency of thinking about a nation's budget like their own household budget, only bigger.