I don't own a carbon fiber bicycle, and your post has convinced me never to get one.
However, I think you are taking something Mr. Genitalia said out of context, i.e.,
Its useful life depends on many factors such as, but not limited to, how much and under what conditions it is used; whether and to what extent it is submitted to regular maintenance checks and so on. ...
... frames used by professionals are used for one, or maximum two seasons
He's not saying that all carbon frames are no good after two years, but rather, that frames subjected to the most extreme conditions of racing for one or two years aren't considered reliable.
Incompetently welded Ti frames can fall apart catastrophically, by the way.