According to sign at southern end the of this loop this path as been closed. Usual Cambs CC slow process the definitive map still shows it as a path.
come-on Cambs CC  update the definitive map, you have changed the on the ground signage. Why not the council's web map?
https://www.cambridgeshire.gov.uk/residents/libraries-leisure-culture/arts-green-spaces-activities/rights-of-way