This is very basic, but in this case, they for instance acknowledge that the goal of liberalisation is not lower prices, as has been said by so many politicians trying to sell these reforms. (They don't go all the way to stating explicitly that full market prices for electricity means denying electricity to some based on purchasing capacity - i.e. the poor; but maybe that's obvious to them.)
Your wider point is noted and worth repeating. In the long run, we're all dead. John Maynard Keynes
As I pointed out originally they ignored some important factors in their analysis and the fact that they reached a conclusion that you are in sympathy with doesn't alter the fact that their methodology was (deliberately?) flawed.
Usually when libertarians find a problem with the "free market" they blame it on excessive intervention by the state. That seems to be what their ultimate goal was in this case as well.
Wasn't it the state that forced the breakup of vertical integration? Policies not Politics ---- Daily Landscape