No, the tokens did not attack the Aetherspark. The tokens entered attacking it. That is a crucial distinction. For a creature to attack a player/planeswalker/battle it has to be declared as attacker during the declare attackers turn based action. That is also the only time when attack restrictions and requirements have effect.

508.4. If a creature is put onto the battlefield attacking, its controller chooses which defending player,
planeswalker a defending player controls, or battle a defending player protects it’s attacking as it
enters the battlefield (unless the effect that put it onto the battlefield specifies what it’s attacking).
Similarly, if an effect states that a creature is attacking, its controller chooses which defending
player, planeswalker a defending player controls, or battle a defending player protects it’s attacking
(unless the effect has already specified). Such creatures are “attacking” but, for the purposes of
trigger events and effects, they never “attacked.” They remain attacking creatures until they’re
removed from combat or the combat phase ends, whichever comes first.