Vegan

You are missing the fundamental part , when they say chickens bred to lay eggs, they don't mean for female chieckens only, because you can't just hatch females.

They have a breed line of chicken (I.e. like you have dog breeds , for example a chihuahua) So males also hatch too. And if you have ever seen a hatchery assembly line, it is a conveyor belt of fluffy chicks, the staff check each chick and toss the males into a grinder. They never make it to grown rooster, because they consider it a waste of resources to raise a bird that is not rotund as an eater.

So the original paragraph is correct, chickens bred to lay eggs, have the roosters killed. For your logic you are insisting on the sentence should have said Hens bred to lay eggs, which would then invalidate the second part.