Howdy! Welcome to the Auth0 Community.
I apologize for the delay on getting the new guidance out (there’s a good reason for it). I am not the author of this post but I will be authoring the new one that uses the new Auth0 React SDK, which is currently in Beta. We also made a new Auth0 React Quickstart available.
I am going to add a note on this blog post right now. Thank you for your feedback.