Yes Karen, it is very simple. If Labour are truly worried about that then let's have a law which fixes the election date. Why are they not suggesting this? They've said they want an election as soon as possible???! So fine, there's how. Pass a law that says the GE can only be on October 15th. Then Boris cannot move the date and slip the UK out of the EU via the back door.
But no. Labour aren't suggesting this because they don't want an election as soon as possible, they want it as late as possible to do as much damage to Boris as possible. That's the fact of the matter and I'm really surprised there's a sole who can't see that.
Whilst all is fair in love and politics, you could be tempted to say, so what, fair enough. The issue with this however is that a November GE binds us to the EU for probably another 3 or 4 months at least, and IMO forever.