I searched it.

First result under the overview is the National Pork Board, shows the answer above the fold, and includes visual references: https://pork.org/pork-cooking-temperature/

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.