No, it can't. Even if a card digivolves from a card that was placed on the field in the same turn, it can't attack during that turn. It can only attack in the turns after it's played.

It refers to when there are 2 or more cards with the same level among all of the stacked cards. Examples include when a level 5 Digimon has a level 5 digivolution card or when a level 6 Digimon has 2 level 5 digivolution cards.

Yes, you can process it. Even if [Kyoko Kuremi] isn't in this Digimon's digivolution cards and this Digimon's stack doesn't have 2 or more same-level cards, this card's [All Turns] effect will unsuspend this Digimon.