4 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Can "trash any 8 digivolution cards from your opponent's Digimon" in this card's <When Digivolving><When Attacking> effect trash a total of 8 digivolution cards from multiple opponent's Digimon?
Yes, it can.
Ruled Mar 28, 2024
If this Digimon attacks after DNA digivolving, does "if DNA digivolving, trash any 8 digivolution cards from your opponent's Digimon" in this card's <When Attacking> effect activate?
No, it doesn’t. If this effect is activated <When Attacking>, only "delete 1 of their Digimon with as many or fewer digivolution cards as this Digimon" activates.
Ruled Mar 28, 2024
Does "then, delete 1 of their Digimon with as many or fewer digivolution cards as this Digimon" in this card's <When Digivolving><When Attacking> effect activate even when not DNA digivolving?
Yes, it activates.
Ruled Mar 28, 2024
If my opponent's Digimon have less than 8 digivolution cards when this card's <When Digivolving><When Attacking> effect activates, does that mean that those digivolution cards can't be trashed?
No, as many as possible are trashed.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.