Considering how many of them say this, it's statistically implausible due to how rare these kinds of farms actually are.
Big-ass, industrialized factory farms need to exist in order to accommodate the demand that there is for so many people to consume flesh and secretions.
Ultimately, in addition, even if it were true, engaging in "humane animal slavery" still does not justify it.
Free-range is a marketing term. It makes people think the chickens get to run around in a field, hang in a coop, whatever. In reality, they are kept in very crowded conditions that often lead to violence between the chickens. And there is of course no such thing as humane ranching, let alone in a factory setting.