I mean, I think that he's got a valid broader point that egg prices haven't been great for a couple of years.
However...that's not really due to anything that Biden has done, much less Harris.
A lot of it was due to major avian flu outbreaks:
https://www.cbsnews.com/news/bird-flu-outbreak-egg-prices-2024/
April 24, 2024
A multi-state outbreak of avian influenza, also known as bird flu, is leading to a jump in the price of eggs around the U.S. — an unhappy reminder for consumers that a range of unforeseen developments can trigger inflation.
As of April 24, a dozen large grade A eggs cost an average of $2.99, up nearly 16% from $2.52 in January, according to federal labor data. The price increase comes as nearly 9 million chickens across Michigan, Minnesota, New Mexico and Texas have been discovered to be infected with bird flu in recent weeks, according to the U.S. Department of Agriculture. That is crimping egg supplies, leading to higher prices.
https://www.cbsnews.com/minnesota/news/egg-prices-rise-bird-flu-farm/
September 9, 2024
LONG LAKE, Minn. — Minnesota shoppers may be experiencing some sticker shock as eggs again emerges as a hot commodity.
According to the USDA, the average wholesale price for a dozen large Grade A eggs reached $4.26 in the Midwest region. That's up $0.09 since last week, but up roughly 20% compared to what was recorded in last summer's consumer price index.
"I'm not surprised by the volatility," Loree Kinney, store director at the Orono Market explained. "There's volatility in milk, there's volatility in dairy products, and in meat. There's not much you can do about the supply and demand."
Indeed, economists have for months pointed to a bird flu outbreak as a key reason for dwindling supplies of eggs across the U.S. coming from major producers.
You can't really lay that much at Harris's feet, though.
I do kind of wonder how practical it would be to have some company just store powdered eggs if the prices are going to be jerking around that much. Can't do a sunny-side-up egg or anything like that, but for baking, it should be fine.