This is why I wanted context - high modulus carbon fibres are good thermal conductors along their length, but not across, especially when embedded in an insulator like epoxy as they often are. Radial fibre arrangements have been proposed, but they're usually too expensive to manufacturer. If someone is manufacturing them now then they may be good thermally as well as structurally. It's about the only way I could see it increasing power handling though, as the more common woven carbon fibre, or carbon fibre loaded paper, won't have that possible thermal advantage. BS from the marketing department seems much more likely, but we'd be in a better position to judge if we could see the original source.