My opponent has no Digimon. I activated this card's [When Digivolving] [On Deletion] effect, but none of my opponent's Digimon were deleted. At such times, is the "if this effect didn't delete" condition met?

My opponent only has 1 Digimon, and it has an effect that prevents deletion. I activated this card's [When Digivolving] [On Deletion] effect, but none of my opponent's Digimon were deleted. At such times, is the "if this effect didn't delete" condition met?

My opponent has 1 Digimon with 6000 DP and an effect that prevents deletion, and they have 1 Digimon with 6000 DP and no effects. Is the "if this effect didn't delete" condition met if I activate this card's [When Digivolving] [On Deletion] effect and delete their Digimon other than the Digimon with an effect that prevents deletion?

Do [On Play] effects trigger for Digimon played into the breeding area by this card's [When Attacking] effect?