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

Can I use this card's inherited effect to target one of my opponent's Digimon with 1000 DP or less and delete it?
Yes, you can.
Ruled Mar 28, 2024
A Digimon with this card as a digivolution card attacks an opponent's Digimon, then that Digimon's DP is reduced to 0 and deleted by this card's inherited effect. What happens to the attack?
No battle occurs, and the attack ends. If there are other effects to activate (When Attacking effects, etc.), the attack ends after activating them.
Ruled Mar 28, 2024
A Digimon with this card as a digivolution card attacks an opponent's Digimon, then the opponent blocks with a Digimon that has <Blocker>. Can I use this card's inherited effect to reduce the DP of the blocking Digimon to 0 and delete it?
No, blocking can only be performed in the blocker timing that occurs after all <When Attacking> effects finish resolving. As such, once a block has been declared, the window for activating this card's inherited effect has already passed, so it can't be activated.
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.