3 official rulings from Bandai, last ruled Jan 10, 2025. Straight answers to how this card actually resolves.

Can I use "・1 of your opponent's Digimon gets -2000 DP for the turn" in this card's <On Play> <When Digivolving> effect to give the same Digimon -2000 DP multiple times?
Yes, you can.
Ruled Jan 10, 2025
Can I use "・1 of your opponent's Digimon gets -2000 DP for the turn" in this card's <On Play> <When Digivolving> effect to give different Digimon -2000 DP?
Yes, you can.
Ruled Jan 10, 2025
I activated "・1 of your opponent's Digimon gets -2000 DP for the turn" in this card's <On Play> <When Digivolving> effect once, and the DP of the opponent's Digimon was reduced to 0. Is that Digimon deleted before the effect activates 3 more times?
No, it isn't deleted yet. This card's <On Play> <When Digivolving> effect activates "・1 of your opponent's Digimon gets -2000 DP for the turn" 4 times, then all Digimon with 0 DP are deleted at the same timing.
Ruled Jan 10, 2025
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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.