I’m not aware of any rigorous modelling that supports what Goering argued though. It’s certainly possible but it’s also not a given by a long shot. FPTP in the UK is not based on the popular vote, it’s essentially the outcome of 650 mini-elections. If Nazi support was efficiently distributed, there’s a good chance they’d have won a strong majority, but if support was focused geographically, they might have ended up with fewer seats.

If you’re aware of any more accurate modelling, I’d be super interested though!