No sir, you were incorrect. You said: "Since the release of the Plus model, the regular model has always outsold the plus model.". Key word, ALWAYS. And I was correcting you as it did not always outsell the regular model. You can try to reword however you like, but it's okay to admit you were wrong.
Also, it wasn't just 3 weeks. It was a full quarter which is 3 months. "the
iPhone 8 Plus outsold the
iPhone 8 in the third quarter of 2017." And because the iPhone X came out, it will be very hard for the plus to continue to outsell the smaller phone.
When the X plus comes out, it will outsell the regular model as that is where the demand is today with consumers. Mark my words.