You are the second person raising this today. :-)
I just double check that the latest version of fabric-samples it’s changed to First-Network (in the past it’s Basic-Network).
I also notice the client code is also modified to use the First-Network. I will take a look and see if some of my articles need revised. One immediate part is that they are using AND of both org1 and org2 as the endorsing policy, which makes our CLI a bit complicated (in Part 2 of my article).
Thanks for pointing this out.