Straddling the fence on Brexit

I'm trying to get my mind around Labour's new policy on Brexit. Having gone from sitting on the fence about a confirmatory referendum, now they claim to support a further vote on the "Tory Brexit Deal" or on a no deal Brexit if the Conservatives push for Brexit before the general election. This is after Labour have said for months that there will be no further referendum. But what is on offer at a general election held before Brexit will be the opposite - Labour will "renegotiate" the deal to leave and there will be no referendum on their deal. So they continue to straddle the fence.