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.
And, following this line of thinking to is natural conclusion, if everyone did this, we'd just arrive back at factory farming.
Also, I'm sure those people eat out at restaurants and probably get fast food without investigating where the meat comes from.
Imagine some dork holding up the McSlop drive thru line because they wanna make sure the shitty burger patties were from ethically murdered cows just to make themselves feel like they are making some kind of difference.