The way its written - meh, stupid article.
It's all about wants vs needs.
My Emonda aluminum ALR5 out of the box is $1000 cheaper than the CF SL5 version of the bike. $1000 buys you a few ounces of weight savings. Or I can put that $1000 into a decent set of wheels and be well over a pound lighter, and have better wheels...With the wheel upgrade - the ALR close in weight to the SL6 - which comes in at $5k.
3k gets you similar performance to 5k.
The CF version of the bike get's me absolutely nothing extra. The only reason to purchase the CF version is to say I have CF.