Yes, these videos are useful and the techniques he uses are pretty standard.
But it's worth bearing in mind that video compresses time (unlike a still photo, which does the opposite) and ther's a lot that isn't being shown in the videos.
Just for a start, the flashguns need to be pretty powerful. Secondly, and especially where honeycombs are being used, they need to be aimed very precisely and this means that both good models are needed and assistants are almost essential, to keep making minor but very important adjustments. And, because there are no modelling lamps, there's a fair bit of trial and error involved, or constant metering.
DIY snoots are standard too - necessary for hotshoe flashes but also very common with studio lights, to get exactly the right effect. They're usually made from blackwrap. Making honeycombs from drinking straws is standard too, just glue a bunch of them together, cut to length, spray them with matt black paint and you've got an excellent honeycomb.
