Yes, the principle is ‘Labour governments are good, do things that make Labour governments more likely.’
Think about it: the message Sunak is trying this week is: ‘voting Labour will lead to chaos’. Yet another Tory MP defecting totally undermines that argument, because it paints the Conservatives, not Labour, as being out of control. That’s a win for Labour.
Secondly, what has Labour’s message been since Sunak took power? It’s been: ‘Sunak is weak’. This makes him look weak. Another win.
Sunak is convinced banging on about small boats will save him. A Tory MP quitting because he hasn’t stopped the boats undermines one of the few lines he thinks works. That leaves him with nothing to say, making him again look both out of control and weak.
The downside for Labour is that Natalie Elphicke is clearly a nutter. But, that doesn’t detract from any of the above. Most people have never heard of her. She’s only going to be a Labour MP for a few months. So, overall it’s a win for Labour.