Do attacks from a rod of tentacles count as magic weapon attacks?

@JeremyECrawford Do attacks from a rod of tentacles count as magic weapon attacks?

— Blauw (@cablauw) February 23, 2017

Tentacle rod—the first sentence of its description says it's a magic weapon. #DnD https://t.co/cyqcf7zKnf

— Jeremy Crawford (@JeremyECrawford) February 23, 2017