If i recall correctly, a smaller notch and 120Hz were both rumored for the iPhone 12 about a year ago.
I suspect we might be giving leakers too much credit. I suspect that this leak on the smaller notch and the leak on the 120Hz screen happening next year might be a controlled leak by Apple to manage expectation on the iPhone 12 that is to be released on 10/13. That gives Apple/iPhone fanatics enough time to vent on this (and other) forums and get over the "bad" news before the actual product is released.
Can you imagine the outrage among iPhone fanatics on 10/13 if they begin watching the keynote fully expecting to see an iPhone 12 with a smaller notch and a 120Hz screen, not see one? The narrative afterwards would be very negative.
Now, with these controlled leaks, I suspect that even some of the fanatics that were mad just a few days/weeks before the announcement of the iPhone 12 due to rumors of missing features/enhancements, end up buying one regardless.
Side note: Rumors say Apple managed to make the notch on the 5.4" model narrower. Why can't they just slap that narrower notch on the 6.1" and 6.7" screens?