It does sound interesting and I think it is much-needed. I rode there recently and the only signposted routes from Truro I found were small lanes shared with ratrunners and a steep climb in an industrial estate up onto a rather rough and lumpy old railway trail out southwards - things got easier once I left the signposted route for what looked on the map like former routes of main roads.
I think there were cycleways out along the A390 which stopped at the first village with no obvious continuation towards the Eden Project. So it seems much-needed to a visitor like me.
But I hope someone can have a word that these need to be built as small motor-free roads, not "off-road" as described on that page, and constructed to decent all-weather standards.