UA Brute: does Brute Force work with unarmed or no?

@JeremyECrawford UA Brute, does Brute Force work with unarmed or no? it doesn't say "melee weapon attack" or "attack with a melee weapon" so it seems just a tad vague.

— James Lysakowski (@Hiro_Zero_Virus) January 10, 2018

If a game feature says it works with a melee weapon, it means an actual melee weapon. As of the Player's Handbook errata, the rules don't consider your body to be a melee weapon. #DnD https://t.co/4AkGFkk4Qj

— Jeremy Crawford (@JeremyECrawford) January 10, 2018