Do bestow count toward cards that say "when [sub-type] enters on the battlefield"
According to the definition of "Bestow" (702.102a), the card will enter as an Aura spell.


  "Bestow [cost]" means "You may cast this card by paying [cost] rather than its mana cost." and "If you chose to pay this spell’s bestow cost, it becomes an Aura enchantment and gains enchant creature.


The game will remove the Creature type from the card. Since Human is a subtype of Creature and not a subtype of Aura, the card loses the Human subtype per 205.1a


  "If an object's card type is removed, the subtypes correlated with that card type will remain if they are also the subtypes of a card type the object currently has; otherwise, they are also removed for the entire time the object's card type is removed."


The ability won't trigger since the card does not have the subtype Human.