Never undestood this.
You literally have to read the title or see the date. Like, if it says "Hack for 4.0.1" or something like that, you know is outdated.
When i hacked my friend's Wii U i knew i didnt have to look for old guides and search for the current firmware version. Its common sense.
I think youtube videos are great for noobs like i was at the time. Not being a dumb person and look for the latest guide is just logic.