You sure? I looked at their 2013 catalogue and no where does it say their 1 series tripod uses carbon fibre. It does say they're using a special type of aluminium.
All of RRS's tripods are CF, save the tabletop model. The 1-series is clearly listed under "carbon fiber tripods" on the site. By looking at it you can clearly see the CF weave. The model chart shows carbon fiber as the construction material.
It is very carbon fiber.

