Do you have a citation for this? I find this to be surprising given that I have heard the exact opposite: That efficient supply chains lead to eggs too fresh to easily deshell when hard boiled.
When I had my own hens I would deliberately age the eggs I intended to hard boil.
I'm similarly skeptical. Both the demand and supply for eggs are probably quite predictable (save for the occasional bird flu outbreak), so why would the industry create big egg buffers/stockpiles?
When I had my own hens I would deliberately age the eggs I intended to hard boil.