Good questions! Yes, I do have chickens for personal production but it wasn't just backyard flocks, it was farmers everywhere and they were very vocal about it in the communities I follow, which is why I stopped the feed from the tractor supply store (it's not just 1 brand either) because they had already seemed to figure it out.
When the deep state predicts a food supply shortage and then food plants start going down in flames 1 right after the other in such a short period of time, then you start to connect the dots. During an egg shortage, chickens across the entire country just stopped laying eggs and what proved to be responsible was all the chicken feed from 1 huge supply chain that practically all chicken farmers use, seems to be a huge coincidence that can't just be considered an accident. It's this reason that some farmers started looking into the Tractor Supply Stores in general to see what changed starting in Sept.

You are correct in saying that chickens lay less eggs during the winter, which is why egg prices tend to go up slightly in the winter, but never have we ever seen them not lay a single egg for weeks! When a chicken doesn't lay an egg after 3 days, there are a series of things to check to make sure the chicken isn't egg bound and dies...the fact that they were able to stave them off for months just blows my mind! It just...doesn't happen! Check this out... https://original.newsbreak.com/@msbirgith-561347/2912999310303-egg-shortage-in-united-states-but-listen-what-farmers-say