This card's effect caused the DP of my opponent's Digimon to become 0. At such times, is the Digimon with a DP of zero deleted?
Show ruling
No, it isn't deleted yet. Once all of the processing for the activated effect has resolved, a rule check will occur, then all of the Digimon with 0 DP are deleted at the same time.
Source: BT22-056 Guardromon