Unless I missed something I think that's the way you have to do it according to @stephen_nutt's original post:
Note: You MUST also create a Routine in Alexa app with same name as the word/phrase you are using in flow and make it perform a 5 second wait. Otherwise, Alexa will try on her own to figure out what you mean and go looking out on the "interwebs". The 5 second wait won't affect the speed of your flow.
