The outcome of the A96 Corridor Review was handed to Transport Secretary Fiona Hyslop three months before its publication.
In the interview Ross was asked about his resignation from his role as leader of the Scottish Conservative Party.
The Welsh dancer had made a return to competing on the BBC One show this year after undergoing treatment for breast cancer.
Czech billionaire Daniel Kretinsky has agreed to a series of legally-binding commitments to gain government clearance for the deal.