I haven't seen a response from Dumor, but in the link I provided, a spokesperson from the American Feed Industry Association, two experts from different state poultry extensions, and the FDA gave concrete information.
I could be wrong, but I think the conspiracy theorists believe "they" are *adding* something to the feed to make the hens stop laying. That theory has already been debunked, but conspiracy theorists are gonna conspiracy theorize, I guess... 🤦♀️🤷♀️...