I guess this author has not seen the poll out today showing that 74% of Americans think there is a deep state. I think President Trump has exposed the deep state to many people who never believed it existed before.
https://www.monmouth.edu/polling-institute/reports/monmouthpoll_us_031918/
“Few Americans (13%) are very familiar with the term “Deep State;” another 24% are somewhat familiar, while 63% say they are not familiar with this term. However, when the term is described as a group of unelected government and military officials who secretly manipulate or direct national policy, nearly 3-in-4 (74%) say they believe this type of apparatus exists in Washington.”
For me ... within days of his election I could see how it was going down. ( As we used to say in the hippie days! )