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

If I have exactly 3 cards in my security stack, do I activate both the "1 of your opponent's Digimon gets -7000 DP for the turn" effect and the "delete 1 of their unsuspended Digimon" effect when activating this card's <When Digivolving> <End Of Attack> effect?
Yes, that's correct.
Ruled Mar 28, 2024
How exactly do I perform " until there are 3 cards in your security stack" in this card’s <On Deletion> effect?
If you have 2 or fewer cards in your security stack when the effect activates, repeat until there are 3 cards in your security stack. You don't have to do anything when the effect activates if you have 3 or more cards in your security stack.
Ruled Mar 28, 2024
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