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I think so as well, and any threat of it will only harden the Tories.
Labour tried to forge a compromise, had they said very very clearly that a vote would be on ANY compromise I think it would have maybe been OK, but instead it was "only a vote on a BAD compromise".
It doesn't help that Corbyn and his advisors are stuck in the 70s economically, Milne has some had some proper dodgy ideas in the past he didn't disown and Brexiters, so when people accuse the party of all sorts, that is unfortunately a true issue (for remainers/compromisers)
And so the mess continues while the Tories stage their own mini game of thrones.
They did this though - there was a no confidence in May sometime around last Christmas which she won. To my mind that means that that route has been done.
Otherwise you can get away with never addressing the 'confirmatory vote' because you're still trying to force a GE.