It's a pity it was mentioned so briefly in passing. From what I have read, Alex Jones has a monthly listenership of about 6 million people? How many people will have likely heard that brief sentence by watching this interview?
Any individual only has to hear about the same thing three times in a relatively short time frame, before they take note. So getting the word "Steemit" out there in front of millions of people is powerful, if a few of them hear the word once or twice elsewhere as well.
Yes it was very brief but he is obviously impressed enough with the platform to mention it. It would behoove one of the developers or a member of the marketing team to follow up on this.