I think that the instructions are just a large hint as to how to set a Snap! cloud server up.
I don't think the team have the time and effort to fully document and maintain them.
They have their hands full just keeping on top of their own stuff 
This is quite common for projects that open-source their code
I myself have had to politely tell people - here is my code - this is how I think I set it up - mine works - sorry I can't help you set one up for yourself - I just don't have the spare time