This is a critical role that the manager plays that the article decides to come up with a unreferenced social psychology manipulation solution when there is a greater problem at hand.... the employee is nervous about shipping the product and wants approval.
The reason why this is because a great manager is supposed to protect and shield employees from the outside so that they can feel at ease with making decisions and working with out fear of making some mistake that costs there job (unlike the article I can site like 5 or so Harvard Business Review articles written by experts that show this is often the reason why employees come to ask questions like that.. yes I'm being snide but I think "What got you here want get you there" is basically on overrated Dale Carnegie rewritten).
Not getting any input sends a message of "I don't really care about your work". And if you really wanted to coach and you really believe this arm chair psychology then why not send a link of the article to the employee asking the advice and say "I would like to give some input but I want to assure you that I think you own this project... etc etc...".
Education is a powerful thing... manipulation is not.