My comment's other grandchildren sum up my thinking fairly well, in particular the one pointing out that the URL of the site is literally "no hello".

I found that a particularly weak argument, and find myself firmly agreeing with the website.

What did you want the url to be? "dontjustsayhellofollowupwithyourquestioninthesameline.com"?

You are welcome to think what you want. The opinion I've expressed here is based on my lived experience with the "no hello" concept as promulgated within a real life workplace---likely before this article was written, but I don't feel the article is a significant improvement on the other communication approaches I've seen. People are very imperfect readers and there is a reason the concept of 'burying the lede' exists.