LBSs are a great source of misinformation. The explanation offered to you makes no sense. The torque placed on the carbon fiber while riding on a stationary trainer is identical to that placed on the road, except without the bumps and cornering forces, which are much more severe on the road. So, if you believe that nonsense, you should not ride your bike on the road. BTW, there are no qualifications to run a bike shop or be a bike mechanic.
Cervelos have lifetime warranties and there is no concern from Cervelo about riding on trainers. Go ahead, try and break it.
Rollers are excellent to develop form and smooth cadence, but unless you get some rare models, they offer weak resistance. Another advantage of the fluid trainer is that you can push beyond your limits without worrying about bike control. It depends on what your goals are.
Most people who buy trainers or rollers don't really use them enough , for those people the cyclops should be fine, but the fail rate on these is huge (they have good warranties ), and they have small flywheels.
All kinetics have a lifetime warranty, even for wear.