No you don't really need to use current polling data to read the referendum. It speaks for itself in that 48% wanted to remain and the other 52% we can safely say would be split between soft/hard brexiters. The fact that 'Hard Brexit' to most people meant leaving the SM and CU still implied that there was a deal involved. So I think that it is absolutely safe to state the the majority of people when voting were in favour of soft/hard brexit/remain. You could argue against this as the No Dealers are attempting to but surely common sense and elementary maths argue against it.
In discussing this at lengths over the years with my fellow activists (!
) I have not heard one person in the party even remotely suggest that "we must just take a line that will lead to a general election, whatever that line is". It just doesn't happen. The vast majority of labour supporters want us to remain, but those that want to honour the election just want to protect the economy and livelihoods by negotiating a deal that does this. I know of not one No Deal labour party in the 50 or so that I have met in our area. Not one has talked of doing whatever it takes to bring the government down. I see what you are saying but it sounds paranoid and twisted in my opinion.