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as long as the EU stick to the same negotiating line that they've had since the start
Yes, certainly, that is a contradiction by implication, but not in the text itself.
As I posted a while ago, I've never been sure whether Labour had an actual negotiating wheeze that nobody else had thought of. I'm still not sure. I think their respect for European institutions would get negotations off to a much better start, but I'm not sure how much further it would go from there.
As they're not in power, they can of course afford the luxury at the moment of saying things like that without having them tested in the real world immediately.
And it makes literally everything that has been said up until that point impossible - as long as the EU stick to the same negotiating line that they've had since the start.
Of course, Labour may have a secret method of making the EU allow cherry picking, but I don't believe that for one second.