He wants us out because he wouldn’t be able to achieve his socialist utopia under EU membership.
Have to agree with that. He's only towing the line because he knows his party and membership are so overwhelmingly pro-EU and that Scotland (potentially key in any GE) comfortably voted remain. Corbyn has attempted a 'sitting on the fence' position as he knows many Labour voters in the North voted Brexit.
His ambiguity has served him quite well so far in trying to keep everyone happy but it has to stop now. He should give his view either way as there has been a complete failure from the opposition to hold the government to account on Brexit. The whole process has been a shambles and a complete failure of leadership from both the main two parties. No wonder we're heading towards a no-deal Brexit.