Most of the time if there isn't a straightforward primary source in the top results, Google's AI overview won't get it right either.
Given the enormous scale and latency constraints they're dealing with, they're not using SOTA models, and they're probably not feeding the model 5000 words worth of context from every result on the page.
People have been eating pork for over 40,000 years. There’s speculation about whether pork or beef was first a part of the human diet.
(5000 words later)
The USDA recommends cooking pork to at least 145 degrees.