You seem to disprove your own suggestion my article’s premise is “fanciful splitting of hairs” with your own quotations.
Post WWII Germany was completely at the mercy of the Allied Powers, and MMP was imposed by the allies with the intention to prevent a recurrence of the war just ended. I have not attributed specious quotations to Mr. Churchill; indeed, it is no secret he was well acquainted with different electoral systems and favoured Proportional Representation. (In fact Mr. Churchill’s idea was to implement PR in cities but not rural areas. Which is effectively what we implemented in western Canada for two or three decades in the mid twentieth century.) Both of these things are known.