3 official rulings from Bandai, last ruled Sep 6, 2024. Straight answers to how this card actually resolves.

This Digimon has [Leon Alexander] in its digivolution cards, and I activated its <When Digivolving> effect. Can it give <Security Attack -1> to my opponent's Digimon that are played into the battle area afterward?
Yes, it can. This card's <When Digivolving> effect affects "all of your opponent's Digimon," therefore it will also apply to opponent's Digimon that are newly played until the end of their turn.
Ruled Sep 6, 2024
If I have exactly 3 cards in my security stack, do I activate both the "1 of your opponent's Digimon gets -6000 DP" effect and when activating this card's <End Your Turn> effect?
Yes, that's correct.
Ruled Sep 6, 2024
When I have 3 security cards, can I use this card's <End Your Turn> effect to gain and then use 1 of my Digimon to attack an opponent's Digimon if my security stack increases to 4 cards?
Yes, you can. Once the <End Your Turn> effect activates, you can perform the part of the effect after "then" regardless of the number of security cards.
Ruled Sep 6, 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.