Q1: If this card digivolves from a Tamer that was played this turn, can it attack in the same turn?

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.

Q2: What does "if this Digimon's stack has 2 or more same-level cards" mean, exactly?

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.

Q3: Can I process the part of the effect after "then" in this card's All Turns effect even if the "if" condition in the 1st process isn't met?

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.

Q4: Does the digivolution requirement that this card digivolve from a Tamer mean the Tamer that becomes a digivolution card is treated as if it is a Digimon when digivolving?

No. Digivolve from the Tamer as such, and do not treat it as if it is a digivolving Digimon. "When digivolving" effects and "when a Digimon digivolves" effects don't trigger. Additionally, if a "Digimon can't digivolve" effect has activated, you can still digivolve from a Tamer with this digivolve requirement.

Q5: Do I perform a digivolution bonus draw even if I digivolve from a Tamer?

Yes, you do. A digivolution bonus draw is performed for any kind of digivolution.

Q6: Is a Tamer card placed under a Digimon considered a digivolution card?

Yes, it is. If the Digimon leaves the field, that Tamer is trashed like normal digivolution cards.

Q7: Does a Digimon gain the security effects in the lower text of a Tamer card in its digivolution cards?

No, it does not.

Q8: Does a Digimon gain the inherited effects in the lower text of a Tamer card in its digivolution cards?

Yes, it does.