I think the idea is that this is for "left of the left" rather than mainstream left parties, which would still include Labour notwithstanding their current leadership.
It would also be a rather... er... substantial misreading of the politics of the present leadership. Labour ran on a solid social democratic platform at this year's General Election not SEIZE THE COMMANDING HEIGHTS COMRADES and there has been precisely zero indication that this is likely to change (quite the opposite actually). In a weird and round-about way, Corbynism has turned out to be about the Left finally burying Bennism and moving on with its life.
I think there's a recognition between the SCG/leadership that they needed to adopt social democratic consensus politics to win leadership and arrest this relentless march to neoliberal madness (that is now attacking the very basics of state provision). I don't however think that any have disowned Bennism long-term and are simply willing to return to social democracy before pursuing socialist proposals (the EU in many ways being the defining divide between the soft and hard left, and on that score you'd expect to see more movement if they had been converted).
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