Does the special shove prone attack count as an unarmed strike?

@JeremyECrawford does the special shove prone attack count as an unarmed strike or improvised wpn for feats or features or proficiencies?

— Derek P. (@rderekp) February 1, 2016

The shove/grapple options (PH, 195) are not considered unarmed strikes or improvised weapons. #DnD https://t.co/CsfH1eKIS4

— Jeremy Crawford (@JeremyECrawford) February 1, 2016