In his example, he uses the subjunctive as a signalling mechanism for a well-written post.
I find that Americans "get" the subjunctive. Were I to live there, I am sure I would also start to use it more.
However, it's a form of speech that very few Brits seem to use. I am indebted to my friends Henry and Polly for teaching me about it (and shaming me into using it correctly).