Yes, a GE is a certainty at this stage, it's just a matter of whether it's before or after Halloween.
My worry is that Cummings is doing his very best to goad parliament into a successful VONC - and if he's got his war-gaming right, then it's what he's after; and I'm wary of doing anything that Cummings wants me to, even if I can't see how he's worked it.
You could be right that he's simply expecting a 2 way split of the leave vote and a 4 way split for remain - and presumably he's gamed that to show that leads to a FPTP majority for the evil empire.
Yes it's absolutely feasible to have a GE before halloween - but it needs to be called before they break for conference season / prorogation; and would presumably necessitate the canceling of party conferences.
You might regret asking that