Yes, but even this very unclear proposition is a recent invention (last 3 months IIRC). Before that they had nothing. For 2+ years.
> Unfortunately it isn't possible to make promises about what will be possible to negotiate with the EU.
True enough -- to a point. But he could say what the general outline of the UK's goals in the negotiations will be and how the strategy/objectives/redlines will differ from TM's and Boris's.
At this point without specifics, we can all be forgiven for assuming it is more unicorn horns and pixie dust. Does "I'm going to go to Brussels and get a deal, a great deal" sound at all familiar by now? I am surprised anyone buys it at this point.
He cannot say for certain how the EU will respond to any proposal, although honestly Barnier has been crystal clear about what is required of the UK and what the options are.
And does Corbyn even know the difference between the Single Market and Customs Union? I have seen no indication that he does.
> Unfortunately London forgetting that the rest of the country exists
Going for a soft Brexit would be a compromise between the rural areas of England and Wales, who want to leave the EU entirely at any cost, and Scotland and NI (and Gibraltar), who want to remain. I would say it is the strategy that takes most into account the rest of the country in its entirety.
Whether or not such a stance would be to Labour's electoral advantage is anyone's guess. They have apparently concluded it would not be.
In fact the EU has been essentially forcing England to listen to the rest of the country -- NI, specificially. Which is quite ironic.