Not completely true. Well, if the games would have been played in a BO3 you would have a solid point. However, given that this is B05, it seems more tricky. I asked Sturmpanther about the how this actually was played out and if I understood correctly the way this worked was that the player that won the first two games had faction selection in the third match.
So, faction selection was not completely random, the better player typically would end up playing the faction that he would consider to be stronger.