So I was right, you do believe that a secretive totalitarian government like North Korea can produce a good life for its citizens.
It is facile to observe that any form of society can 'produce a good life' for some subset of its citizens. You have not persuasively argued that conceding this point means agreeing to the bizarre equivocal statement that 'there is no reason to chose liberal democracy over totalitarianism.'
The post author avoided mentioning any other means, and has not explicitly stated a belief that an authoritarian country can't be just as good as a liberal democracy. I am going to assume that is what he believes until he states otherwise.
Oh, and as long as we are at it, what is your belief on this matter?