That’s an exaggeration. I run in to things, in the official videos, that have changed since the video’s were made all the time. That certainly is annoying, frustrating and a minor hurdle in the learning curve. But it doesn’t make them “completely useless”. Most of the time it just requires a bit of common sense to figure out what’s changed and why.
Often times I actually find myself learning more as I have to go off and research the change. So it has a sort of weird backhanded benefit.