That's a very uncharitable way of interpreting the headline. From the article body: "the epidemic there alone has killed nearly one-quarter of all the world’s pigs".
What he's saying is that 100% of those pigs that died due to the epidemic would also have died within a year anyway. The title is crafted in such a way that you picture a whole, static population of pigs and a quarter is removed from this whole. Like we start 2020 with 75% of the individuals of 2019. As if the mortality rate shot from something normal up to 25%. When it actually was 100% all along.
Without the epidemic title could have been "All of the worlds pigs died in a year due to humans killing them to eat their body parts".
Not saying the epidemic is a good thing, but at the end of the day it doesn't make a whole lot of difference from an individual pig's perspective.
