The major egg supplier for most of the grocery stores decided not to buy as many pullets to replace the ones they culled from Avian Flu, and then the second and third largest also followed suit. As a result there was a bug supply crunch that coincided with Avian Flu cullings. Unless Biden was there making command decisions about how many pullets to buy that year he had nothing to do with it.
It could have been investigated. Even this article states prices went down as a likely result of the investigation. Turning a blind eye bears some culpability. All we heard during those years was that it was due to avian flu shortage, and if you mentioned otherwise, you got shouted down by politically connected people.