I will say, in a lot of cases, they aren't BS-ing/lying with intent. Just the general way their minds work seemingly isn't compatible with the very idea of laying out the process in its entirety (inc. the warts/hacks/workarounds).

So what ultimately winds up happening is, you'll roll out the process according to the official way, and then it is drip-drip-drip of changes as you find out the real-world version.