Molly Scott Cato is their leading economist:
Most important, she would not be focusing the narrative of her budget around the deficit. We believe that austerity is a political project, designed to reinforce the power of financial and corporate elites, and achieve the long-held ambition of those on the right in politics of bringing about the shrinking of the state. Closing the deficit is not our prime economic objective; the important thing is to build a more equal and ecologically sustainable economy. We would balance the current account over time, but are prepared to borrow to invest.
Molly Scott Cato apparently doesn’t know the difference between the current account (trade related) and the deficit (government budget related).