This was published in 2014, and that shows. Much of the technology it refers to has been superseded, and the terminology employed is what you’d expect from network managers rather than, say, education technology co-ordinators.
Having said that, the basic advice here is very sound: good principles do not age, or at least not very quickly.
The main bugbear is the price, to be honest. I’m not sure it’s worth paying £25 for.