Major Tom
Super Anarchist
They probably used Soric, which is an infusion medium , in place of coremat which is probably specified in the build manual. The infusion resin flows through the honey comb lattice of the Soric and the centre of each cell is a similar construction to coremat. To an uneducated eye it looks like honey comb, but in reality honey comb would never be used in infusion because every cell would be filled with neat resin which would make the laminate much heavier than a coremat laminate.There is an interview on Sailing Illustrated where one of the competitors says that honeycomb was used, and the illegal boats are 30 lbs lighter.