

Q1: 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.
Q2: Can this card's On Play When Digivolving effect suspend a different card from the one that's given "can't unsuspend until the end of their turn"?
Yes, it can.
Q3: Can I activate this card's inherited effect even if my opponent's Digimon and the Digimon that has this card in its digivolution cards are deleted at the same timing?
No, you can't activate it.
Lv.4 Kuwagamon BT22-047 C Champion | Virus | Insectoid/CS [On Play] [When Digivolving] Suspend 1 of your opponent's Digimon. Then, if this Digimon's stack has 2 or more same-level cards, 1 of your opponent's Digimon can't unsuspend until their turn ends. --- [All Turns] [Once Per Turn] When this Digimon deletes your opponent's Digimon in battle, gain 1 memory.
Lv.4 Kuwagamon BT22-047 C Champion | Virus | Insectoid/CS [Digivolve] Lv.3 w/[CS] trait: Cost 2 [On Play] [When Digivolving] Suspend 1 of your opponent's Digimon. Then, if this Digimon's stack has 2 or more same-level cards, 1 of your opponent's Digimon can't unsuspend until their turn ends. --- [All Turns] [Once Per Turn] When this Digimon deletes your opponent's Digimon in battle, gain 1 memory.
Lv.4 Kuwagamon BT22-047 C champion | Virus | Insectoid/CS [Digivolve] Lv.3 w/[CS] trait: Cost 2 [On Play] [When Digivolving] Suspend 1 of your opponent's Digimon. Then, if this Digimon's stack has 2 or more same-level cards, 1 of your opponent's Digimon can't unsuspend until their turn ends. --- [All Turns] [Once Per Turn] When this Digimon deletes your opponent's Digimon in battle, gain 1 memory.
Lv.4 クワガーモン BT22-047 C 成熟期 | ウィルス種 | 昆虫型/CS 【登場時】【進化時】相手のデジモン1体をレストさせる。その後、このデジモンにLv.の同じカードが2枚以上重ねられているなら、相手のターン終了まで、相手のデジモン1体はアクティブにならない。 --- 【お互いのターン】[ターンに1回]このデジモンがバトルで相手のデジモンを消滅させたとき、メモリー+1。