You could be right, heck I really dont know. I am not familiar with those wheels are the spokes used in compresion and tension also? What are the differences between the two? Carbon is a great material with mucho promise but I think i has limitations just like any other material. I think the compromise between safety and performance has to be re exanined. The lighter we make a bike and the more we use exotic materials narrows the performance/saftey envelope.
But this isnt really what the question was either. could string be used instead of spokes. Yes due to the way a traditionally spoked wheel works.
If you want to use string to replace the spokes in a wagon wheel......... well good luck.