Does the new College of Swords Blade Flourish fall under an Attack Action?

@JeremyECrawford Does the new College of Swords Blade Flourish fall under an Attack Action for the purposes of using my bonus attack for TWF

— Matt Conner (@MantidMan) May 1, 2017

If a feature says in its description that you use it as an action, that's a special action, not Attack, Cast a Spell, etc. #DnD https://t.co/2gc1jhiJoM

— Jeremy Crawford (@JeremyECrawford) May 1, 2017