Revised Ranger, does ‘whirlwind attack’ count as an attack action for the extra attack feature?

@JeremyECrawford does the revised ranger's 'whirlwind attack' count as an attack action for the extra attack feature?

— Will Nouwen (@getefix2) May 25, 2017

Extra Attack requires the Attack action, not any action, such as Whirlwind Attack, that includes an attack (the proper nouns are key). #DnD https://t.co/VyW74IT2A2

— Jeremy Crawford (@JeremyECrawford) May 25, 2017