The point is not to sell defective gear, specially not at this price, perhaps maybe look up the tensile strength of carbon fiber composite?
you can probably get a better idea of what we are talking about, when it comes to failure the margins are much less than steel or aluminium.
if someone can put the needed stress to crack this Rim on most roads , the rider is an absolute beast. i mean there a lot of other advantages besides strength and low weight, it's is a material with heat conductivity x 40 times less than aluminium and 10 times less than steel, saving your magnets in the long run.